AirBNB is getting really unpopular in some European cities, Reykjavik is actively going after renters because of our laws currently say you have to get a license to do this.
The problem this new type of service is doing is creating a big problem in popular city destinations, landlords are no longer renting to locals because they can make much more money with tourists, so cities that are already expensive to find a place to rent are getting much worse.
In a small city like Reykjavik they estimate over 1000 apartments are now strictly for rent to tourists because of the tourism boom here, and this has raised rent prices as well, its infuriating.
http://www.vice.com/read/barcelona-tourism-backlash-822
http://grapevine.is/?s=airbnb