I highly recommend this place.
It is located in Villa de Grácia, a neightbourhood that is like a "small village" inside Barcelona but completely different from the overcrowed touristic Barcelona, but still walking distance from Sagrada Familia, Passeig de Gracia, Las Ramblas, Parc Guell and all the tourist sights. Villa de Gracia has a natural charm and its "plaças" are filled with locals and tourists alike eating tapas and drinking cavas outside, enjoying the evening... And still being a calm neighbourhood to sleep without constant evening noises.
The appartment was confortable and very clean. We felt like at home.
The place has several markets near as well as fruit stores and bakeries and coffee places not even 5 minutes walking distance.
Isidre was a perfect host. We had all the needed stuff (towels, sheets, pillows) and some extras (shower gel, water, milk, coffee) which made our stay even better.
He gave us several tips for restaurants near by and recommendations for things to do (Magical Nights at Casa Batllo was amazing and we won't know of this if it wasn't for Isidre's recommendation).
Overall a perfect experience in Barcelona.