We had a fantastic stay at Joaquín's apartment. The apartment is in a really good location - lots of good bars and restaurants close by. The apartment itself is clean and comfortable. The only criticism was that there were no toiletries provided (shampoo, shower gel etc which you usually get with any air b&b) - we bought some and left for the next guests :)
Joaquín was a great host - good communication before our stay, and he greeted us at the apartment when we arrived and left, and also gave some useful travel advice for Barcelona. I would definitely recommend staying here, and next time I visit Barcelona I would try and stay at Joaquín's place again.