The apartment is really nice, quite close to the Sagrada Familia. We went to Barcelona for a music Festival at the Forum, and the place is really close to the location (20 min walking), so for us it was perfect! (not so near to the main turistic spots, but the metro station is really close to the apartment)
Javier is great (even if we met him just once). He was flexible about the check in and check out times, always answered very quickly to the messages and suggested us some places where to eat.
The room is a little smaller than it looks in the picture (and the pillows were not really comfortable), but the apartment and the flatmate we met were great.