We had a really nice stay, and the apartment is huge, perfectly suited for a large family, very original, with a nice terrace. It is very well situated, many shops in the neighborhood, metro and various attractions (la Pedrera etc.) very close by. The contact, and the service (repair of a problem with water tap and shower even on a bank holiday) were perfect.
Only negative point: we were surprised to have to pay the city tax, 4,50€ per person per day, cash, on arrival (in addition to the price of the location) - without any indication in the AirBnB description.
But besides this it was a perfect stay, and we really enjoyed our family holiday in Barcelona!