Great apartment in a very nice location! Our family (3 adults and infant) spent 12 nights in Gonzalo&Laura's place. We enjoyed with great location close to everywhere: 15 min walk to Sagrada de Familia, 20 min by bus to the beach (4-5 stops), 5 min to metro. Great supermarket nearby and well equipped kitchen allowed us to taste lots of local food, wines. Gonzalo was very welcome and showed us key Barcelona's attractions on the map also he was of help during the whole stay.
Couple of moments worth to mention about apartment: wifi was not working in the bedroom and was breaking in the living room since it's away from the router... It's a bit noisy in the bedroom since windows are on the street, though after couple of nights we accommodated and it stopped distracting.
I would recommend the apartment for those who want enjoy great time in Barcelona.