Excellent host - Diego was helpful in every situation, with him you are guaranteed a fast & friendly response to any question you may have.
The apartment is very nice, well-equipped and clean. Quite small, but perfectly enough space for one person. Can be a bit noisy in the evenings, but that's the case in most Barcelona apartments.
The location is very convenient - supermarket right next door, many other stores around in the neighborhood, walkable distance to the center (also easy transportation by metro) and quick access to Montjuïc (highly recommended to visit as the parks there are lovely and the views of Barcelona - magnificent, especially at sunset).