Agus was very helpful and was waiting for us at the apartment when we arrived to hand over the keys and show us the apartment.
The apartment is quiet and as just as described in the profile. It is also true about being up a lot of stairs (89!) so this is maybe not a good choice if you are unfit or have small children.
Taxi is €30-35 from the airport depending on how much luggage you have. There are 4 metro stations surrounding the apartment, all about 10-15 minutes walk away. There are several Supermercados and bread shops nearby.
We can thoroughly recommend this apartment and will use it again when we return to Barcelona.