Pretty underwhelming apartment. Pickings were slim for a summer weekend in Barcelona, so we ended up here because there wasn't much else, but it was not the kind of place we wanted to spend time. It's very dark inside and all the windows look directly into other apartments so there is no privacy. One of the bedrooms (the one with the big bed) is totally dark because the windows open to an air shaft. The AC is only in the living room so the bedrooms were hot and stuffy with the 40 degree temperatures, although there were 2 fans which helped.
The location was good and I did take the bus back from the airport after returning our rental car, which was nice. We enjoyed the proximity to parks and the museum and the fountain show. I walked to the Gothic Quarter which is about 30 min away by foot. If you don't plan to spend much time there, this apartment will do.
Worth noting that it does have an elevator but you have to go up a full flight of stairs to get into the building.