I heard that the housing there is pretty good, subsidized, and available for away rotators (which is nice). But if not, craigslist is a great resource -- just make sure you dont go too far north (above 99,100) or east of park/lex), but can go wrong south of 96th.

Hey, you should try and reach the housing office. They will give you a mailing list were you can request the students for sublets. Many of us will be going away for rotations and will need to sublet our places. I myself will likely be gone in October.

Try studenthousing.org

They have some short-term housing for students in NYC. It looks like a pretty good deal for the places I saw when I was looking. Good luck.