Fantastic location; easy walk to the Metro, good walk to Casa Vicens, a great plaza just down the street with good breakfast (check out chök) and good tapas and drinks. The apartment itself is spacious and comfortable, and the responsiveness was good.
The only real downside is that the apartment is a third-floor walk-up, and the stairs are pretty steep. It made us plan our day trips with fewer returns to the apartment for refreshing and resting.