Lance and Shelly is the loveliest couple ever! They are open-minded and very enthusiastic about learning from different people and cultures. The house is nice and clean; they take care of everything themselves. It's conveniently located near the train station, the airport, and the center of Boston.
The only thing I would advise future guests, though, is that parking is a problem. You won't find parking in the area, not even those public garages. It's better only to use public transportation, and not driving to the city.