The apartment is really nice, seems quite spacious due to high ceilings (old building) and is perfectly located - Sagrada Familia 5 mins, Passeig de Gracia 15 min on foot, beach on Barceloneta and most of other attractions are within 5 metro stations. Surrounding area is nice and calm, containing many cafes /restaurants / shops and nice architecture.
Alex was very nice, provided us with tips about the neighbourhood and suggestions about what to see based on our preferences.