Our host was polite, cool and on time for meeting us for the keys, answering a few questions we had etc. He was also discreet. The flat is as described, 7 minutes walking from Sagrada Familia, and is very clean. It has pure natural light, with a small balcony with no view, but we didn't plan to spend time inside the house, so that was o.k.
The mattresses in both rooms are excellent quality, all the 3 of us had very comfortable sleep. It has a bedroom with a double bed, and a bedroom with a single, but comfortable bed. The living room has a nice sofa and excellent wifi, really fast.
Plus, you find tea, coffee, sugar, salt, olive oil etc in the kitchen.
In the entrance of the building is a nice Bakery with ecological farina goodies. That was a wonderful surprise, very convenient, to buy some stuff before you go to explore the city, since the quality is so good at this place. All worked fine and we enjoyed our staying at Carlos place, not missing anything.