Nice car-free neighbourhood <5 minutes walk to the metro station which takes you everywhere. Feels safe & quiet, lots of families around the square. If you're not in a rush it's within a longer walking distance (45-60 minutes) to most of the tourist attractions. There's a great local restaurant across the square (Fragments), and good sushi near the metro station, and a couple of supermarkets close by.
The roof terrace at Carlota's is nice to sit outside in the sunshine, is quiet and feels private. Even when the square was busy with a celebration the apartment wasn't noisy. The apartment had all the things you expect, good wifi, and a comfy bed.
Highly recommended.