The response time & communication from the host was second to none. It takes about 30 mins from the airport to the apartment. The area is quiet and looked safe and not far from Monumental metro so great for a family with young children. The host allowed us to leave our bags when we arrived early 11:30 and when we checked out. I can’t fault them or the apartment. Sagrada Família is a stones throw away with plenty of eateries without being tourist traps. The only negative was the boiler cut out now and then and needed re-setting but this was not a major problem. Others have said the walls are thin and yes we could hear the neighbours but we hardly spent any time in doors so was also not a problem. The pictures online make it bigger than it is. The facilities ie WiFi kitchen and outside area is outstanding.
So to summarise I would highly recommend this apartment.