We enjoyed our stay at Mary's place. The house is beautiful and well located for anything you want to do in Boston. Be sure to have a car, or you will rely heavily on Lyft/Taxi.
There is a good coffee shop a few blocks away. Few amenities in the apartment means you get to get out and try the local restaurants.
Bring earplugs if you are a light sleeper to compensate for the street noise and upstairs BNB guests. The beds are comfortable and it's lovely to have the space to spread out. There was AC in each bedroom and in the sitting room.