I stayed with Boris & Susan for 3 days and 2 nights.
What was amazing: The place was clean and welcoming. It was close to the airport which was a huge plus! Direct and prompt communication on behalf of the hosts, which I highly appreciate (no misleading at all). Each room had separate locks and the main door had a separate lock so I felt safe.
Even better if: Unfortunately the location (East Boston) was not the perfect fit for me. I had to travel to Cambridge and Lower Allston often and the uber/lyft were expensive probably cause of the traffic. Of course, the hosts would not be able to help in this regard but worth considering when booking your stay. (I did not have the opportunity to take the Blue T but it is fairly close to this place).
Overall - 4.5/5