The apartment is great located in the touristic area of Sagrada Familia. Has a big supermarket nearby (mercadona) so we could get groceries and prepare meals at home. It's also very close to 2 metro stations: line 5 and line 2, and this allowed us to easily get around in the city. There are many great shops and bakeries in the avenue just below the place.
The apartment is big. As a family of 5 we each had their own space, although I would prefer having 2 single beds instead of one of the double beds. It has a main hall with a dining table so we could all sit down to eat together.
Albert is great and friendly. He gave us his phone number and was responsive.
As for the down sides - we visited in winter and the apartment was cold. There is an air conditioner and radiators in each room, but that wasn't enough in our opinion.
Second problem was the noise from the avenue - in the main hall and bedroom we could hear people walking down the avenue (even at night).
All in all a great place