I stayed at the place with my friends for three nights, and we did enjoy the stay: the flat is very close to a metro stop, you have quite a few restaurants and shops around. Borja was very responsive, it was easy to communicate, we were also allowed to check-in earlier, which is always nice.
You also have 3 rooftop terraces with a wonderful view. This was my favourite bit, as you can access one terrace straight from the kitchen, so we enjoyed breakfast on a beautiful sunny day, and spent evenings hanging out on the other terrace with a beautiful view of Barcelona. Highly recommend the place, nice host, great value for money.