Our stay in Barcelona couldn't have been more perfect. Alvaro was a kind, gracious host. He was helpful even before we arrived, with prompt answers to my inquiries. He even offered to pick us up at the airport! (His mom, Susana, actually picked us up-- she was lovely, and helped us get acclimated right away.)
The apartment is great-- spacious, light, and equipped with everything you need to enjoy your stay. It's in a wonderful neighborhood, walking distance to many of the sights you'll want to see in Barcelona. We happened to be in Barcelona for Business, and the apartment made a great HQ, with speedy wi-fi and a good-sized living room for working, and four separate bedrooms with very comfortable beds.
I'd definitely recommend both Alvaro and the apartment to anyone who's visiting Barcelona.