We stayed at Pilar's apartment for a week. We absolutely loved it ! This has been, easily, our best Airbnb experience.
The location is perfect. Within an easy walk there are great restaurants, metro stations, all sorts of little shops, bakeries, pharmacy, convenience stores. There is a lot of character in the few surrounding blocks. The area feels very cozy, not as touristy as lower city. The closest crossing street, Carrer d'Enric Granados, may be the most beautify street in Barcelona :)
The apartment itself is very charming, with lots of light in the living room and the master bedroom. The balcony is small but is perfect for a cup of coffee in the morning, or a glass of wine in the evening. We also made a good use of the washing machine in the kitchen - it is very efficient. The kitchen is fully stocked and has all the basic necessities. The elevator is small but very functional.
We recommend the apartment to other guests and we'd definitely use it ourselves, if we ever come back to Barcelona.