It is quite difficult to find off-campus housing anywhere near College Walk that isn't already taken or being offered for over $2000 a month. I was actually offered a studio apartment that I'd "only have to share with 4 other people". 🙄
I have heard of people who find decent apartments online by searching with various keywords, i.e. "apartment under $1000" with "Morningside Heights" or "Harlem". Otherwise, I've been advised to live close to a bus route/subway stop that goes to Columbia, and if that fails, find something on the Metro North line. It all depends on your tolerance for city traveling, I suppose. I like the convenience of just walking across the street to class, but the premed advisors said at the PPS they just don't have room for all the Post-bacs. Oh well, that just gives me more study time on the bus. 😎