My son is a member of 2014 and is hosting a candidate tomorrow, which he's excited about. He did the program in January of his junior year - basically AF only offers daily visits, other than orientation (in April) which is only for candidates with appointments. I know a few others who do get the overnights - mostly recruited athletes or "target" candidates. Tomorrow he picks up his candidate around 9:30 and brings him back around 3:30. Before that the candidates have a briefing, and if you're at least a second semester junior, you can meet with your counselor.
As far as hotels, we've been happy with the Drury Inn. Not as much so with the Best Western Academy Hotel - mostly for customer service issues (nothing wrong with the hotel itself).