Andrea and Tivian were great hosts, offering a room in a recently renovated 2-story apartment. The apartment spans a slightly elevated ground floor and a basement where the top of the room is above ground. The guest bedroom is in the basement, and the bathroom is on the ground floor through the common area (living room, kitchen).
I arrived Boston at 11am, and the check-in time is 3pm, but Andrea and Tivian were still kind enough to let me drop off my luggage in the apartment so i could go out and see the city. They were both at work at the time, but were easy to reach via whatsapp or other ways of communication listed in the instructions they send you the day before you arrive. The instructions for getting in were also easy to understand.
The entire apartment was being deepcleaned when i got back later in the evening, and everything was sparkling clean and ready by the time i wanted to go to sleep.
Locationwise the neighborhood is nothing upscale, it's a couple of minutes walk to the subway stop you can (Should, rather. It's quick, cheap, and easy) take. It's a nice walk during daytime, but i'm not sure how much i would venture out in the neighborhood by myself during nighttime.
Andrea and Tivian were great hosts, very friendly and nice, offered me tea when i was in the livingroom with them, offered advice on what to see and do in Boston, and saw to my accommodations.
Only thing that i didn't like when living there was the location of the bedroom in the basement, it's the room that faces outwards where there's a sidewalk outside 20cm from the window of the room, about 1m from you when you're in bed sleeping. Fortunately the neighborhood is quiet at night so i slept well, but it's still uncomfortable, and of course not possible for anyone to do anything about.
Overall a very good stay in a nice apartment with nice hosts at a nice price, with quick access to downtown and the airport.