Stayed in this 3BR apt during marathon weekend with my parents, coach and boyfriend. Kitchen is fully equipped and roomy, we were able to cook a few nights. A smoker lives downstairs unfortunately but Damon has an air purifier in every room, and you don't notice a smell at all. My boyfriend and I shared the bunk bed room. The full-size mattress on the bottom was very comfortable.
Didn't get to meet Damon in person but he was very easy to contact and we exchanged a few emails in advance.
Roslindale is a nice area- some good health food groceries, good restaurants. T is within walking distance.
Bring your own shampoo/toiletries, FYI. Decent value.