This is clean, reasonably well maintained apartment right in the heart of the city, walking distance to most things and easy taxi or public transport connections to everything else! There is a massive full service mall just around the corner for all of your needs (whether food or toiletries).
The apartment is indeed exceptionally quiet despite being in the busy hub of the city. The majority of the apartment is spacious but the room with the bunk beds is very small.
While I don't believe it should deter most people from staying in this apartment I believe it is fair to mention the entrance to the apartment building is on a small strip of the street that has the appearance of being a bit seedy. The entrance sits right between entrances to a casino on either side. While we had no reason to believe any of this actually made the area unsafe, some of the characters we saw hanging around made it seem as though it could be (we didn't feel comfortable having our teenage daughter wait outside the building for a friend who lives in Barcelona to pick her up for lunch). That's just us though.
Maria is a very responsive and helpful host!