My partner and I had an excellent stay at Valerie's modern yet cost home.
The house was very clean and tidy; detailed and accurate advice on Boston and its sights was offered and free bottled water was provided in the room. The room is in the top floor and has air con. There are stairs to the room but this lazy man with a 50lb pack had no troubles.
We found the houses links to both the City and to the airport very convenient and the area seemed safe. There is a serviced laundrette down the block should you feel the need.
Breakfast was toast, fruit and the best strong coffee I have had in the US.