The place was very nice - just right for a couple and/or a +1 on the sleeping couch. We found everything we needed in the kitchen and the bathroom was very clean.
Checkin was very smooth as well and Sergio is a responsive host.
Keep in mind however that the apartment is a bit further outside of the city center, which is not a problem with the metro. Going with a bicycle or on food it would take you a bit to get to the place, and from sagrada famiglia it is mostly uphill.