3dender

McCourt has a capstone project as well. And as for internships, you won't be able to work off campus for the first year at any of the other schools as well. That isn't such a huge issue (in my opinion). You'll always have international organisations and like you mentioned as a point under SIPA, you could build connections with your professors during this time. 
Furthermore, esp for someone with lack of work experience (I'm in the same boat), I feel DC is particularly advantageous. 
And I completely agree with @thex11factor about disagreeing with you on the last point under Georgetown. 
That being said, it seems pretty evident that your gut tells you to go with Sanford. I'd say you should follow your gut. They seem at par in my eyes. 
Best of luck making the final decision. Just make sure you aren't underestimating McCourt's reputation to make the decision easier (as @3dender mentioned). 

That's a good rundown.  I'm speaking as someone who has just decided on Sanford (after their wonderful Open House last Friday).  Here's some thoughts in list form:
-I would say you have underestimated McCourt's reputation -- everyone I've talked to considers it the best of the DC schools.  Also, they have agreements with GWU and American which let students take classes between schools.
-Would your international status allow you to intern in DC?  My understanding is that this is the route a lot of students take in order to get experience, even if they can't get paying jobs.  
-For SIPA, you really have to consider program fit.  All the int'l reputation in the world doesn't, IMO, compensate for a miserable, directionless grad experience.  Are you able to attend any Open Houses or virtual events?  I would definitely get in touch with current/former students beyond those at gradcafe, in order to either confirm or rebut your impressions here.
-I share most of your impressions about Sanford.  I can tell you that there was a healthy focus across concentrations at the Open House, with sizable factions interested in Int'l Development and/or Nat'l Security.  But you're correct that there are lots of Education and Health folks, which makes sense given Sanford's reputation in these areas.  I myself have sort of a niche interest (political reform), but was able to find faculty/courses there that will nurture it.
-As far as location, I already live near Durham so I can tell you all about the area if you want to PM me.  I'll say here that you shouldn't really consider Durham by itself, but rather as part of the Research Triangle which includes Chapel Hill and Raleigh (it's 20 minutes from each).  In that sense there's a lot to do, though it's definitely not as metropolitan as either DC or NYC.  But on the other hand, outdoors activities and green space are much more accessible here.
-Finally, you didn't mention WHERE you think you want to do your policy work after graduation, and that is one of the most important factors in this decision.  Do you want to stay in the States?  In DC?  Do you plan to move back to your country?  If you want to work internationally then SIPA makes a lot of sense, and my impression is that Sanford has the weakest int'l reputation of the three.  If you want to stay in the States, however, SIPA is probably the least useful, with Sanford and McCourt probably being on par.  Even if you want to stay in DC, Sanford's network there is strong and doesn't lag too far behind McCourt.  Of course the latter would give you much more practical experience and connections there. . .
Hope this helps!

Well, I am a bit sad with the atmosphere here. I think if you are great, you will find ways to overcome difficulties and be successful no matter whether you hold a HKS degree or not. Resilience over challenges is also a quality that HKS highly appreciates. There are many different solutions and pathways in this life that I hope we can find the most suitable one for ourselves.  
If I were younger, I must have been very disappointed when things went wrong so I can understand and tolerate that emotion, but now I have learnt to take it easy and find ways to move forward. Keep positive energy is more important

Actually no, WWS has both a regular program and a mid-career one. @Palolem I think a lot of people take themselves out of the running because they don't think they can get it, especially since WWS explicitly states that in order to be competitive you need at least 2 years of public service along with good grades and GREs. Also, WWS has a different vibe to it than other programs like SAIS, SIPA, Fletcher, etc. It usually attracts a similar crowd as HKS and Goldman instead. 

.01%=0.
Since I do not get funding either, I do not plan to fly to Boston from India.

It is time to say byebye to HKS------ a money sucker!

HKS=Harvard Kicking School.

HKS's stinginess absolutely pulls down the quality of its incoming class! I would not attend even if I have funding because I do not want to pull myself down with those who do not get funding from the waiting list. One year's time is precious for me to keep with the high quality people. A large group from the waiting list would get accepted next week. these grapes are not sour!!!! 

you are soooo nasty....

I agree that your 2nd concern under Humphries looks like a dealbreaker.

If you know you aren't willing to go to HKS without funding (and I don't blame you - going into that much debt seems insane), I would advise pretty strongly against going to admitted students day.  Their job is to sell you on why you should go to their school. I didn't apply to HKS, but other admitted students' days I've gone to have made me really excited about the programs.  If you go, I'd hate for you to fall in love with the program and then feel disappointed that you can't afford it; or worse, feel tempted change your mind and make a bad financial decision to take on enormous debt.  Since you already have a full ride from a different school that you feel is just as strong, it seems like a no-brainer to take it. 
If you already have your plane tickets purchased and can't get your money back, why not turn it into an opportunity to take a mini-vacation and explore Boston? It's a fun city with tons to do. That's what I would do if I were in your shoes.  Just my two cents.

@zling My other schools should be in my signature.  My main factors in applying were the quality and location of the programs.  I'm different from most applicants in that I'm older and with a family, so it had to be some place we would all like to relocate for a couple of years (my wife's skills are easily transferrable).  We currently live in a small town so were excited at the idea of moving to a major city for a couple-few years.
I'm in it for more of a generalist degree than you are -- as I mentioned above, I see myself working in the non-profit sector doing policy research and advocacy.  I also wasn't sure about the strength of my candidacy after such a long layoff and "merely" being a public school teacher for the last decade or so.  So I applied to the major programs -- Berkeley, Chicago, Duke, Columbia -- as sort of a prayer, while being sure to line up some back-ups behind the next tier (I had a list of 3-4 that didn't have apps due until April, just in case I didn't get in anywhere).
Happily, it turns out I could have applied to way fewer schools.  American was my first acceptance and made an extremely attractive offer along with a terrific recruitment event for their "top prospects" -- they're clearly trying to move up in the rankings and compete with GT and GW as best of DC.  I've kept in touch with a couple candidates I met there who both told me that despite getting into way better programs, they haven't liked any of them as much as American when visiting.
After that, it was basically going to come down to who gave me the best offer.  Chicago, even though much more expensive, was enticing just for its name, until I visited of course.  LBJ didn't offer money but was still the cheapest out of any of them -- alas, in the interim my wife and I decided that Austin was a little too similar to the Raleigh-Durham area that we currently live in.  Berkeley, Columbia and GW didn't offer me money and declined to negotiate, making the decision on them easy.   Duke came in with a generous offer, basically a half-ride, which was less than American, but difference in living costs made it still way cheaper.  And finally I got offered a full-ride from Maryland.
So it was pretty easy to whittle the acceptances down to American, Duke, and Maryland.  Duke is the least appealing location for us, since we already live here, but there's an obvious convenience factor in not having to move with two young children, find schools for them, get a house, etc., all while starting grad school and my wife at a new job.  When you combine that with the significant difference in prestige between Duke's degree and the other two programs, it's really kind of a no-brainer.  As i write I'm waiting to attend Duke's Open House tomorrow, just to make sure I don't have the same sort of visceral reaction I had to Harris.  Assuming I don't, I'll be able to commit shortly (still trying to get them to up their offer after Maryland's full ride!).  Because my wife and I still want to move at some point, we've compromised and committed to relocating after I graduate in two years.
That was maybe more in depth than you were expecting, but what can I say? Like many, I enjoy talking about myself.  I'm not sure how helpful that will be for your own decision, but as a more "mature" applicant I will offer you some unsolicited advice: think long and hard about what you see yourself doing in two years after you graduate, then in five years, then in ten years.  If you're set on IR, there are logistical factors like geographical location that make DC more convenient.  But being, presumably, less attached than me in other areas of your life, you also don't have to follow the path of least resistance.  Ask yourself which city appeals to you more.  Try to imagine yourself in each place (and in each season!).  
Hope that helps, and I wish you luck.  Also, as one of the deans told me when I was trying to negotiate more money: as major as this decision is, all of your options are great, and you really can't go too wrong with whatever you choose.  Reminding yourself of that may take some of the pressure off of this decision.
 

@zling I'm not sure if "snobbery" is the right word, because it really wasn't either of the things you mentioned.  Maybe arrogance?  I had the distinct impression that they were trying to dazzle us with their wealth (e.g. they gave us an impressive swag bag upon entry) and their prestige (name-dropping faculty is normal, but talking constantly about how elite they are compared to other schools, and trying to suck up to us with the same message isn't, IMO).  
Had they done these things with a flawless event I may not have noticed them, but there was remarkably little thought put into some of the proceedings.  The chosen facilities were not big enough for the turnout, and there was literally no comfortable place for us to eat lunch -- most of us had to sit on the floor.  They kept bragging about us being "the most students ever" to attend the event which was downright confusing: they were responsible for inviting us all and had to have a rough algorithm for how many would accept, so they knew what the turnout would be when they were organizing it.  But they talked it up like it was proof of their greatness, when really it just seems like evidence they're trying to grow their program (e.g., perhaps to better monetize their brand?).
So yeah, my chief impression was of them trying to dazzle us but in a rather lazy, even contemptuous, way -- after all, they would have to think pretty little of us naive grad students if they really expected us to be swayed by a fancy water bottle and their legendary name.  (This was arguably colored by my first interaction with them, when someone called me about my acceptance/offer, asked where else I had heard from, and immediately told me "Oh, we're way better than them!")
I will say that when organizers got out of the way and just let their faculty talk to us, the presentations were damn impressive.  Also, I was in a distinct minority of the 300 or so students in attendance, many of whom seemed enraptured if a little confused by the occasionally shoddy accommodations.
 

I think this comes down to what you want to do for your career.  If you know you want to do IR, then Georgetown seems like the place to go.  If you're not set on IR, then few places are better than Harris for an MPP, especially going into private sector outside of DC.  If you definitely see yourself in DC, then Georgetown would probably be the way to go (though tbh Harris's DC network is nothing to scoff at either).
Something to complicate your decision is Harris's relatively new Pearson Institute for Global Conflicts.  They are trying to ramp up their brand in IR as well, and a significant amount of students at their Admitted Students Day were there specifically for Pearson.  My impression (though I'm no expert) is that the Harris brand will open more doors outside of DC, possibly even internationally.  
Have you attended the Admitted Student events at both schools?  Because I think gut reaction is an important factor too.  I was personally pretty turned off at Harris --  I just sensed a pervasive snobbery about the place.  Friends I've talked to in academia have corroborated that feeling.  If you've attended events at both places then you know how they made you feel.  Otherwise, you may try to talk to people who attended each one.

I'm an amateur, but my understanding of Berkeley is that while it's policy school, Goldman, has an elite brand, neither the school nor university are known for their international training.  SIPA, on the other hand, is considered more elite for programs of international relations/development.  Georgetown and Johns Hopkins are also top programs.  Just geographically speaking, even if both programs were equal it would make more sense to study on the east coast for its proximity to Europe.
But take this with salt.  Somebody please correct my inexpert impressions if they're way off.

I currently live about 20 minutes from Duke, got half-tuition paid there, and see myself ultimately settling on the East Coast.  
Last and least: as I understand it, Sanford's degree/network has more cache on the West Coast than Goldman's has in the East.  (I might be mistaken on this, and feel free to correct.)