I greatly enjoyed staying at Kristina and Chris' house, the space was spotless, well taken care of, and had all the necessary things available when I arrived (towels, sheets, maps, password for the wireless connection ...) - there was nothing amiss. I was greatly impressed with how responsive Kristina was to all my emails related to the booking and prior to arrival; this made it really easy to arrange my check in even while the family was out.
The studio is located in a lovely neighborhood, very quiet and almost exclusively residential, so that there is not a lot of traffic. Extra bonuses of the place: the next metro station (Stony Brook) is a short walk (less than 10 min) away, the train gets you to the city center in less than 20 min; if you walk for 10 min into the other direction you'll find yourself in the center of vibrant Jamaica Plain with access to a number of restaurants of all varieties and price range, stores etc; and close by is the Jamaica Pond - I even went for a run in the morning in the park (with dozens of locals who appear to do that all the time).
All in all, staying at Kristina and Chris' place was a great experience and I would come back any time.