I have rarely stayed in an Airbnb this good. The location is at the corner of Valencia and Girona streets, which means you can reach pretty much everywhere in Barcelona in about 15-20 minutes on foot. Passeig de Gracia is about 4 blocks away. The Sagrada Familia is about 8 blocks away. Right next to the apartment is one of the nicest small markets of Barcelona with fresh fruit, vegetables and everything else that could be needed.
The entire building is Airnbn apartments, and the hosts are there every day. The apartment was large and very comfortable: a fully-equipped kitchen; living / dining room with a fantastic view; two bedrooms; full bathroom.
The staff is incredibly helpful and always available by phone or email or in person to support things like taxi transfers or answer questions.
The rooftop terrace is fantastic.
I was on vacation with my daughter for a week, and staying here really gave us a different perspective on Barcelona. I would love to come back.