Flat was very good: two nice bedrooms and a BIG, really nice roofterrace. Flat was clean and pretty. There is aircondicion in a livingroom, but not in the bedrooms -- so hot nights can be hot, but for us it was ok.
Contact with hosts was excelent. Pepe (who is the guy taking care of the flat) was really helpfull. There where even colouring books waiting for our kids! Elevator is not really big, but that was not a problem either.
Location is excelent. Montjuic is really near, as well as Plaza Espana. La Rambla and the old city is 3 metrostations away -- or few kilometers by foot.
We were there really happy. Five stars and recomendations!