We had an absolutely brilliant stay! The apartment is on a vibrant plaça that is full of life - nice places for coffee or a beer and plenty of space for the kids to run around the tower, chalk, or play soccer. The neighborhood is super fun (also nearby plaça del sol) and conveniently located to explore the city. We were welcomed by Lucas, who was a perfect host.
The apartment was very nice (although the beds are not ultra sturdy), good kitchen, and lovely balcony. As other reviews indicate, the plaça is a lively place (also at night) so there can be some noise, although this was not problem for us at all (on the contrary). The place is not cheap, but seems to be reasonably priced for local standards.
Warmly recommended.