I think you're quite right that unhosted rentals are more problematic. Every short-term rental horror story I've heard has involved unhosted rentals. However,

I think you're quite right that unhosted rentals are more problematic. Every short-term rental horror story I've heard has involved unhosted rentals. However, from an enforcement standpoint, I can see how difficult it could potentially be to have to make distinctions in each and every case. If a host is there to let you in the door and then leaves, is that a "hosted" rental? Does the host need to be in the apartment 100% of the time you're there to count as a "hosted" rental? What if he steps out for an hour? Does the host need to employ some sort of time tracking system as evidence of his presence? What if a host and a guest dispute the amount of time the host is present?