Me and 2 friends had a great stay in the apartment which is super clean and has plenty of nice facilities. The location is good in a quiet area close to Sagrada Familia and a metro station that can take you everywhere in the city.
The kitchen is not super well equipped and dont book it because of the balcony - it is nice but is turning towards a construction ground.
Also note that this is a professional company and has little to do with the original Airbnb concept. They work with tourist tax, late check-in fee, noice alarms and make you sign contracts at check-in. The apartments are a jazz concept which I still dont really understand what means. The place is packed with signs asking you not to play music but we found a left joint in one of the plants which maybe support the feeling of living in a jazz home :)
All in all I think the place will suit most travellers