Dave, I rented out my own house with AirBnB once, and do not keep a sign out. I would definitely not appreciate my house being marked on a map as a guesthouse because of that. However, as you got the data from a survey, I don't see a problem in those cases.
Only a main tag like guesthouse if it is clearly marked as such. I would personally look into a solution like adding something in the line of externalid:airbnb=12345 and website:airbnb=http://airbnb.com/property=12345 . As far as I know there's no proposition for a generalized external id of things. Wikidata is used for that, but that's just one of many providers in my opinion. I once wrote a diary entry about the possible use of such a tagging style: http://www.openstreetmap.org/user/joost%20schouppe/diary/34328
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