Our family of six loved our stay here. It was really wonderful to be able to see Sagrada Familia so often, right from the balcony. The metro is just across the street from the apartment, so getting around was extremely easy!
There were three rooms, so plenty of space for us. We didn't cook, so cannot speak to the kitchen. There are plenty of small supermarkets and restaurants on the street. The rooms do not have A/C, so they might get hot in the summer, but we stayed in October and it was pleasant. It's noisy outside til very late (like 3am some nights, or all night), so having the windows open might be hard for kids. For our kids, we closed them and just had the fan going and it was fine. The adults slept with our window open and the temperature was wonderful.
Communication was good too- responses were always fast. They met us outside the apartment to give us keys and show us the apartment.