I stayed here for two weeks and generally had a really good experience. The neighborhood is out of the busier city center, but very close to public transport, restaurants, grocery shops, and the best Saturday organic farmers market (Principe Real).
The room is essentially in the corner of the flat so I found it to be relatively quiet. It is a shared space and it is in the middle of a neighborhood with some construction so not silent, but very manageable. It is on the 3rd floor, so be prepared for stairs and it did get a bit warm on the hotter days (80°+). The hosts provided a fan which helped with heat and white noise.
The shared kitchen and bathrooms were cleaned regularly from what I could tell and the flat was tidy overall. The kitchen had what I needed to create simple meals, including some oil, spices, etc. The other guests were friendly, but mostly kept to themselves.
The room itself is quite large. There is now a desk in the room, which was nice. The bed is very firm. The hosts changed the bed and my linens after the first week which I appreciated.
If you are looking for a shared flat experience, I highly recommend this place and this room specifically.