Safety becomes a big issue for this kind of thing. It might make sense to start by leverage a platform like couchsurfing which has a personal review system.
Good point; I think it would initially involve some personal vetting as well as starting at a local level. This could be made part of the listing process where the only way to get verified as a member is to allow a designated photographer if you're hosting, and some kind of social proof (LinkedIn?) if you're looking for a space. I think this is a bigger concern in remote towns and the countryside, though. For a city like Amsterdam, safety might not be that big of an issue.