Me and my family had a great time in Maria Luisa's apartment. It looks just like on the pictures and the house was nicely decorated with christmas items. The neighborhood is very well located, close to plaza d'espanya, and very quiet.
Maria Luisa was not there herself as we arrived on Christmas day but Nadia kindly showed us around the house and explained how we could get to the key attractions in Barcelona - including maps and everything.
We would certainly recommend this place!