Johanna really came through for us. Upon arrival, nother listing turned out to not be what we expected. There we were on the street with our bags and no place to go. We found Johanna's listing, she responded immediately, hopped on her scooter and met us at the apartment a half an hour later. Really great space, with some very nice touches to make us feel welcome such as a bottle of wine, orange juice in the fridge oh, and a lovely bar of chocolate.
While some of the sites are walkable, further out from the center then we would have liked. But it was just a couple of blocks from two different metro stops. There's a full Supermarket right on the corner, and a great Cafe and Bakery right across the street for breakfast.
I would definitely recommend this place for your stay in Barcelona. It was just me and my wife, but there was a spare room with bunk beds so a family could be quite comfortable.