Pluses: the apartment looked exactly as it was on photos. Windows were into the inner house area, so there was no disturbance from the street. Everything was clean and there was all equipment necessary.
The receptionist was always very supportive and fast with replying.
Minus: I could not, unfortunately, give a high rate to the apartment, since, as it turned out, sound isolation in it was very poor. I could hear upstairs neighbors talking normally during the evening, which was OK. But later I was waken up by their loud sex sounds and noises at 3 AM, which was not OK.
I had to bang on the wall hoping they will hear it and stop. (Thank god they did.) But my sleep was ruined and I was tired the next day. I was staying only for 1 night.
Therefore, I would not choose this apartment on my next visit to Barcelona.