Finally not that bad
I had a room without window in a shared flat. Of course the walls are thin but when everyone is quiet there is no problem.
The bathroom was also okay, no major problem.
I slept pretty well!
The building is owned by people who work together, I suppose (Blanca, Maria and Ingrid) who we can talk with via the chatbox.
The real problem came from the reactivity of the host. If you have any inquiry contact them at 3pm, time from when you can enter the room, because they take some time to reply.