Our stay at Mark’s place was great. He was very responsive when we had questions. The rooms and bathrooms are really clean and well appointed. The bed is very comfortable.
We were visiting MIT which was very close. We also walked and took public transportation to other parts of Boston.
There are 1.5 bathrooms that are shared among the visitors of the 4 rooms. That worked out fine for us.
I would definitely stay there again if we need to be in the Cambridge area.