I got my invite in August and that same day all of the October seats were taken. I barely squeezed in before halloween.
You should really be quick to set up the earliest possible date. Now whenever I can confirm an interview, I do it within the hour of getting the email. Worry about scheduling details afterwards.
Stay with a host, they live 100 feet from the admissions office and the nearest hotel seems like 2 miles away.
Good Luck, NYMC is a cool place and the interview is laid back!