Somerville

Somerville allows short-term rentals only in the host's primary residence, requiring a mandatory certificate of registration and limiting unhosted rentals to 90 days per year.

You can only host short-term rentals in the home where you live for at least nine months of the year. You must register with the city, pay a $250 fee, and follow strict safety rules including a mandatory inspection. If you are not staying in the home during the rental, you are capped at 90 days of hosting per year; if you are present, there is no annual limit.