From the pluses, I can highlight a good location, cozy.
Of the minuses - noisy neighbors from upstairs, you can hear everything they do (the ceilings are very thin), shared kitchen.
Also keep in mind that the hostess will charge you an additional deposit of ~$60 dollars, which she says is usually refundable after 30 days. And of that, $7 for checking your photos and passport (not refundable). You can`t avoid that - you will lose your booking without moneyback.
Overall, it's hard for me to say if this room is worth my money, given the prices in Boston, in Europe I wouldn't rent rooms like this for that kind of money.