Cristian's apartment was quite spacious for us as a family of 5 (3 adults + 2 children). Excellent location 5 min. each from 2 metro lines, 15 min ride to the centre. The apartment is also 1-2 min. away from several grocery stores which is quite handy as well. Wifi, heating, tv, kitchen etc worked fine, we had no issues and really enjoyed the stay. Sagrada Familia is about 15 min away on foot, Sant Pau Hospital (Unesco) is 7 min away. There is a very exquisite collection of books in the living room (manga, design, art, history, fiction) which gives the apartment and its owner a special touch.
All in all, very recommendable.