Hey guys,
Columbia gives you the opportunity to stay with a current student. If you get a first year, you will probably get to stay in Bard Hall (the first year dorms), which should be a good experience. Flying into LGA is a good idea, but don't get a hotel!! I suggest staying with a student host at all of your interviews and I think other people on this forum will agree.
I am signed up to host students and will probably be doing so for most, if not all, of the interview dates. Feel free to ask me about anything if you have any questions. I hope to see you all in New York!