I am a grad student of Columbia University. Living with two other friends from Columbia. Both are very friendly and intelligent.
The apartment is 10seconds walk to the A, B, C, and D line. Only one stop by A or D train to Columbus Circle (59th st.).
There are many shops two blocks down including Wholefoods, major clothing stores, and fast food if you like. Several deli are located within 30sec walk from the apartment.