I've stayed in Juanans place with my wife for a long weekend for participation in Barcelona marathon.
Juanan was very communicative and it was easy to arrange everything, nevertheless we didn't see him personally but his friend was very friendly showed us how to use the flat.
Apartment is small, clean and cozy very suitable for long weekend. Flat is near metro station and walkable distance to Sagrada Familia.
To sum up it was a good price and quality stay, and I would recommend it for long weekend stay.