Location is very good (Sagrada Familia right after the corner) and there are good transport links.
Overall, the apartment was nice, but there were some issues that bothered us throughout our stay. The most painful was the bathroom. The bathroom door cannot be closed (always stands slightly open, unless you push it very hard). Also some issues with the furniture and shower door. The water in the shower was not always good (hot). Sometimes the thermal power heating didn't fired up so we could only get cold water.
During working days there were some construction works in the building early in the morning 8-9 AM (after this interval we were out) with a lot of noise.
However, the host was available for any questions; unfortunately these were not issues that could be fixed during our stay.