Pre-arrival information was very helpful and it was easy to find the apartment from the metro. We were earlier than planned but it was easy to keep in touch with Pilar by text and she came to let us in and show us everything. It's in an unusual old building in a residential area. There are plenty of places to eat nearby and a supermarket round the corner for basics. The apartment had everything we needed for our stay.
We really liked the local area and getting away from the crowds in the busy touristy parts. The only negative I can think of is that you are aware of the neighbours upstairs but this was just last thing at night and first thing in the morning. I would definitely go back if I was staying in Barcelona.