This room is far from the city center, but you can get there pretty easily because of the public transport.
The description is inaccurate, there were no towels and you can't use the kitchen (despite being shown in the pictures). I guess it was my mistake to assume I could after seeing the photo.
The room was too warm (+25°C) and the floor was a little bit dirty. The door was broken and didn't close.
The bed was really comfortable and the self checkin convenient.
I didn't even see the hosts.
If I had to go to Boston again, I'd try to stay somewhere else. I've stayed at free hostels around Spain and of course I'm not going to say that they were better, but they were free and still I had the same overall feeling that I did feel here (paying 50€).