This apartment is in a truly fantastic (and very posh) location walking distance from Sagrada Familia, Casa Mila and Casa Batllo. We were very comfortable and happy. The apartment was very stylish with lovely showers and cooking equipment. Oscar booked us a cab back to the airport on our last day with a very friendly driver who told us lots about Barcelona. Had a wonderful trip overall.
My only advice to other visitors would be to take a working phone - Oscar was not at the property when we arrived so we waited a while and then had to ring him. Also if there are more than two of you take your own towels - there aren't many in the apartment.