Belen and Neo's apartment in Barcelona was a perfect home base for a week in the city. We stayed there with our two children, and the house is set up great for a family -- with a tub, kids books, two rooms with twin beds on the quiet side of the house, and a projection screen.
The location simply cannot be beat. There are a half dozen bakeries and grocery stores within a few blocks, some of the best restaurants in the city under 10 minutes away (some less than 2 books away), and we walked from the Sagrada Familia church (25 minutes) to the Monjuic Castle (although I recommend taking a cab up the hill and walking down). 5 minutes to the Ramblas area, 20-30 to the port -- really we only got in a taxi twice the whole week.
Check in was simple and communication was great --
We wouldn't hesitate to return.