This really makes me wish there were an "AirBnB for groups" -- a way you could make a listing which was only visible to people in a certain community, and then manage the stays (including keys, maid, etc.). I don't think I'd want to go through the process of running a public airbnb property (where it seems the social convention is to accept people like a hotel, unless you're full) and turning a bunch of people down.
What'd really be great is if someone did that for design conferences. Seriously, all they'd need is an airbed or something, and you could stay in a stranger's apartment, and then meet a really good friend who's going to the design conference!