The apartment was great overall. The location was unbeatable. We literally walked everywhere from the apartment: bars, shops, restaurants, landmarks, etc.
We also appreciated the little gestures such as coffee available for us, and a welcoming cava bottle.
A few things to improve which I mentioned to Bruno are:
Ventilation for the room next to the entrance door. It got very warm in there and made it difficult to sleep. The living room couch was very uncomfortable to sit. And it would be great to have instructions on how to operate the laundry machine. We tried doing laundry in it, and the machine logos and cycles were confusion.
Other than that, AMAZING PLACE. I would come back to it if I am back in Barcelona one day.