The apartment is as shown in the gazillion pictures: spacious, clean and tastefully decorated in a less-is-more style. The beds were comfortable, even the sofa bed, and it was very quiet at night. Plenty of amenities (also excellent wifi) and we appreciated the elevator (4th floor). Alex welcomed us warmly, he was kind and communicative via Whatsapp. He also immediately replaced a shower head that didn't function properly.
Public transport (metro and buses) are to be found in the area, but are all a bit of a walk (600m), as are the larger supermarkets. To make it to/from the airport we ended up taking a taxi (fare is around 30 euro).
We'd gladly recommend the apartment for an enjoyable stay in Barcelona!