Nice, but I'd like to see a couple more things:
* Verification by credit card as a feature on profile pages - I would wager that credit cards are a better trust metric than facebook profiles. I'd like to see it count for something on a profile page.
* A balance between opening up a lot of personal data to stay at someone's place and sharing it with the whole world - I'd like my profile photo and video profile to be hidden from search engines. Only hosts who I want to stay with should be able to see it.