Juan was a great host. He picked us up from the airport for a fair price and was very helpful with recommendations. He was available during our stay too but we didn't need him.
The flat is exactly as described, very clean, well designed and has everything you need. There are no real doors in the apartment so you hear everything that is going on in the flat which wasn't a problem for us though as we always went to bed at the same time.
The house is next to Sagrada Familia. Two metro stations are around the corner but you can also walk to Eixample and the old town from there. I totally recommend the apartment and the host!