Unfortunately, the neighbours during our stay were extremely loud. We have stayed in Spanish apartments before and knew that they aren't always the best sound-proofed. This apartment however, was the loudest we have yet experienced. We could here the people on the street below and especially our next door neighbours. It felt as if they were in the room with us and I often woke late at night, when they came home, thinking someone was in our flat (you could actually understand what they were saying).
Other than that the apartment was okay. For me, it could have been cleaned better - it had a musty smell and some of our towels had stains on them. Also the floors were dusty in the edges (as if someone had just briefly swept them) and the shower was calcified. Overall, this left the impression with us, that it was not properly cleaned between two guests.
The location of the flat is very close to a metro station - that was a huge plus! You can get into the city very easily and conveniently.