I'm also making the move to NYC this summer, and I have several friends up there who have given me great advice. It's definitely a quick market, so in-person apartment hunting is ideal, but you can probably do online shopping if you have to (which is often more feasible for students moving up there). Train lines are important when determining what neighborhood to live in; one neighborhood might technically be closer to your campus, but if you have multiple transfers, that can tack a lot of time onto your commute. If you're looking for roommates, Facebook can actually be a great resource; Non-Gypsy Housing has ads for both lease takeovers and roommates needed in already established leases, which can help with the whole "most landlords want you to make 40x rent" deal. There's also Gypsy Housing, which is essentially the same set-up but is limited to artists.
I'll be starting Performing Arts Administration at NYU in the fall, and would love to meet other future students! I'll probably be looking for roommate(s) as well, but I'lm likely moving up in June/July as opposed to August.