Hi folks,
Apologies for the long delayed reply. So, yes, NU is Northwestern, and yes, the psych. program is based in Evanston. However, Evanston is actually much more expensive to live in than Chicago proper (unless you're living in Lakeview or Gold Coast or something...). Also, yes, that stipend is what every entering Psych. grad student gets unless you're externally funded or get a special incoming fellowship. I received a special incoming fellowship, but it was the same amount as everyone else's "University Fellowship." I REALLY love my program and my mentor and my lab on the whole.
To follow up on some comments as well, I think that $20,000/yr is a normal-high stipend. I've got friends who are getting close to $30,000 (Penn) and friends who are getting $17,000 (Temple).
Good luck to all of you who are applying this year! It's one of the best decisions I've ever made, so I truly hope you all end up feeling the same way.