I've just stayed with my family - husband and two daughters (9,12) and we had a great time. It is the most wonderful, unique, apartment - as you can see from the photos - and staying here felt like an extraordinary privilege. Sean and his parents, who live in an adjacent wing, are very welcoming, interesting and kind and made us feel very at home, without being intrusive, so it felt as though we had the apartment to ourselves.
It had everything we needed for a short stay and is brilliantly located in the north of Gracia, just next to a metro station and bus stops. I couldn't recommend it more highly.