Well, it is owner run, so it depends on the owner. But, for the most part, I have found the people who list on there to be really, really nice, and very flexible.
I used it in Egypt, Israel, Dominican Republic, Mexico, Luxembourg, London, New York City, Miami Beach, L.A., Paris, Ireland, Puerto Rico, Colombia, and Spain - And everyone I met was very cool, and I never had any problems.
Write to them, tell them why you need the room, and I hope (and even suspect) they will be very understanding.