dude this is a great idea. i asked about something like this just over a year ago http://www.advrider.com/forums/showthread.php?t=84499
but never followed up.
i'm in nyc (riverdale) and i can offer a couch or thermarest. the place is a studio so don't expect a ton of privacy. but one or two people could crash with no problem. plenty of safe on the street parking. safe residential neighborhood just north of manhattan. public transportation to anywhere.