Great location in the Gothic Quarter. Walking distance to many of the major attractions in Barcelona. Beautiful brickwork in the living room, and primary bedroom. Cute bathroom/shower. Would definitely recommend to friends/family. As well, Reyes was able to accommodate us travelling with a baby by providing a pack-n-play, and high chair (thanks!)
That said, I would like to call out 2 points. Not major concerns, but something to consider if you're looking to book this apartment.
First, I'm 6'1" (185 cm) and the doorways throughout the apartment are quite low. We stayed at the apartment for 7 nights, and I ended up hitting my head on numerous occasions (very frustrating to have it happen fairly consistently, and to always have to duck through the doorways). If you are taller, then please keep this in mind, as you will very likely do the same.
Second, there is a restaurant situated right below the apartment. The noise from restaurant patrons in the courtyard out front is quite tolerable, and doesn't go to late. However, in the apartment's interior courtyard, the noise from the kitchen is decently loud. My wife and I were travelling with our 1-year old, and would go to bed around 10 PM / 22:00. We could hear the noise from the kitchen until about 1 AM (washing dishes, talking, etc.). We did have a white-noise machine which luckily drowned out the sounds from the kitchen. If you're travelling without children, and plan to be staying up later, this probably won't impact you. But if you do want to go to bed early, then be mindful that the noise may keep you up.