It's a fantastic location in the heart of Boston and is a great value. The room is a bunk bed with a small bathroom. It's very modern and doesn't feel cramped at all, was definitely pleasantly surprised especially since the local hotels were pricey considering the last-minute decision to visit Boston. Security is good (have to enter three codes before getting into the room). Only issue came on second night, when the half the power in the room (including the A/C and wifi) just shut off completely. That said, while I texted the host and did not receive a response until the morning, I did not call her, and so it's certainly possible she would have sent somebody to fix it. Ultimately this seemed like an unusual circumstance and even in the summer, it isn't unbearably warm at night.
Ultimately was happy with the room and think it's a good choice for those who want a clean and budget Airbnb within walking distance to most of Boston.