The apartment is perfect: cosy and well-equipped. The hosts are lovely: They are right upstairs, available for whatever we needed, and yet it the apartment has its own (distant from theirs) entry, so it also felt secluded/private. There is a lovely, peaceful garden with table and shade umbrella and we often had breakfast there. It is a lovely location: secluded from the city up on the mountain, yet the city is very easily accessible by transit (5-10 minutes by car to the train station, and the train is well integrated with the subway system so you pay one low fare to get wherever you are going in downtown Barcelona).
The only drawback (not their fault!) is that both Google Maps and iPhone Maps apps had trouble locating both their home and the train station, so don't count on your GPS: be sure you have their directions to get there. The one time we did get lost, we called and Jose Luis immediately came and found us and led us home! Leaving your car at the nearby train station (free parking) is the best way to see the city: we found driving and parking in Barcelona very stressful, so each day we would park at the train station (only a few minutes away, but quite complicated: let Jose Luis show you how to get there!) and we would then take the short train ride into town: transit is easy and cheap. Highly recommended.
Estela and Jose Luis were wonderful and kind. I have special needs (allergy to fragrances) and they made special efforts (washing the linens without fragrances) to make it safer for me. My wife was feeling ill upon arrival and when we came to drop off our luggage and they realized she was not well, they let her nap several hours before we were entitled to begin our stay, even though they were still cleaning the apartment. They are truly kind and lovely people.
We have already stayed there twice, and we hope to return to Barcelona and stay there again!