The apartment of Anna & Vince at the Sagrada Familia is great. From the airport we took the Aerobus and the Metro. The description how to get there was very good. The communication with Frederic to get the key was also very easy.
The apartment is very well equipped, so that in theory you can for example also cook there (which we did not do ;)). From the apartment you can explore Barcelona on foot without problems. I would not hesitate to choose this apartment again as accommodation in Barcelona.