Regular email updates from Edu before and during our stay, made us feel welcome although everything was prefect and we had no need to contact him. I have a bad knee and was doubtful of the claim "walk everywhere" but it was very easy. We walked to Sagradia Familia, Museums, the Cathedral, the port and los Ramblas only used the metro to get to Park Guell, but walked back (down hill).
Great restaurant recommendations especially Casa Alphonso, I would book as they were busy.
Aerobus from airport takes you almost to the apartment and runs frequently, recommended.
On the negative side the although silent when the double glazed windows were closed and despite being on the 5th floor, the traffic noise could be loud at times. The lift had a low load limit and we had to make two trips when going up.