Great stay and value if you are visiting Boston!
If you are looking to visit Boston and NOT spend a fortune on a tiny hotel room in the city. I would definitely recommend Mario's place! Its an older place/neighborhood but good for tourists who need a home base to get out and around town. The place was really spacious with three bedrooms. There is only one bathroom. The host was really responsive when we needed some extra towels.
Parking is free on the street. We had two cars and did not have any issues. There are a lot of stairs in the Air bnb, so bookers should be aware of that. Pretty much everything we wanted to do in Boston was a 15 minute drive or a 10-15$ uber. Would stay again!