Everything was great with the apartment! Sergio was waiting for us when we arrived, helped us with our luggage and explained everything relating to the apartment. He was fantastic with our late check-out, too. The apartment was clean and the photos are a true copy of its reality. The bed slept in (main bedroom) is very, very comfortable.
The location is excellent, too. You can walk to Sagrada Familia, and Joanic metro station is just a few minutes walk away. There's a supermarket across the road and a bakery right next door (which sends heavenly smells up the apartment every morning!).
My only complaint is that it is very noisy from the traffic in the road. Even with earplugs we heard the cars from around 7 a.m. As we're not used to so much noise, if I had known that, I don't think I would have booked this apartment. Other than that, it was perfect, though.