Sooner rather than later, take Amtrak, fly, or drive to NYC, get a hotel room, and spend 2 or 3 days at NYU and Mt. Sinai speaking with as many medical STUDENTS in different year classes as you can about how THEY feel about their educational and social experiences at each school, the upside and the downside, about costs, financial aid, housing, clinical rotations, faculty, whatever you need to know for making a decision. Then, make a decision.
You will get an excellent medical education at either but it is the educational environment that contributes to making you a happy camper or not. You will also experience one of the most interesting, gastronomic, entertaining, intellectual, artistically and culturally varied city in the US, to say nothing of the rush hour subway system about which perhaps the less said the better. Owning, driving and parking a car in Manhattan may not be a viable option; think of the money and aggravation saved by that.
Good luck, you are on your way!