Rosa and Miguel were wonderful hosts. Very helpful and communicative, also in English. They gave us advice where to go in Barcelona when we first arrived. They even picked us up from the airport with their car and helped us find transportation to the Barcelona Port at the end of our stay (we didn't order a Taxi in time and they went out of their way to solve our problem).
The apartment is beautiful, very clean and convenient. It is a short walk to the metro. The metro ride itself takes only a few minutes to reach the old town. There is a supermarket 2 minutes away from the apartment. It was also very nice for us to be able to easily walk back from the "magic fountains", which are quite close.
In short, a very recommended place to stay!