With a 5am flight, I got a twin room because I just needed a place to sleep near the airport. The room was not cleaned very well. There was hair on the shower stall and sink. The sink shelf also had spots of sticky gel on it and there was no other surface to place my toiletries. The room reminded me of a college dorm room with AC. My room and assuming the other twin rooms are located and accessible from the emergency stair well that overlooks the alley with a great view of the trash bins.

Aside from the cleanliness, the room has bolt locks. Walls were slightly thin, I can hear neighbors upstairs and the plumbing. The stairwell buffered extra noises from other guests. Not sure how Boston ever got this expensive. The location is great but if you're not in a rush to the airport, best go get a room in the burbs (prob more clean + free parking without the annoying crowds) and get parking for downtown activities.
The parking garage is just a few steps away and we'll lit. As a solo female traveler, safety is a big concern.