I live in NYC and think that something like this here would only solve one of the major problems we have with Airbnb. If it is enforced, the 90-day cap should be enough to keep apartments from being taken off the market during a housing crisis so they can be used as full-time hotels. That is really important, because it is the more affordable apartments that are most vulnerable to this, since they don't usually have a doorman or a landlord that is likely to care that much.

The problem it doesn't solve, however, is the fact that hotel guests shouldn't be staying in apartment buildings unattended by a host anyway. It creates terrible problems for people who are actually trying to live there, since Airbnb guests will treat your building like a hotel. I would much prefer that a host always be required to be present if the rental in question is an apartment.