It also prevents a legal and valid use-case -- renting out your couch every night of the the year. So long as you still live in the place yourself full-time, this isn't illegal under most municipal codes.
This was the case at a place I stayed at in Boston - the place was a 3 bedroom apartment, 2 bedrooms were occupied by long term tenants, while the room I was in was exclusively for AirBNB.
I think rooms get far less than a full apt, even if you get the same space. Just having to deal with another person there means you can't totally relax in most places. (Like walk naked from the shower to the room.)
