Those four nights we got to spend in the appartment of Barbara and Ian were far more than we had expected. The decoration of the appartment was astonishing and well thought out. The location of the appartment is as central as it gets and you can reach everything easily by foot. It is also surrounded by good restaurants, some of my own recommendation are Lolea (make a reservation ahead, theyre always fully booked), Restaurante Loto (best ramen and japanese style cheesecake + coffee i had) and Takumi Ramen (try out their takoyaki, its superb). Our hosts were very generous in handing us out information regarding good bars, clubs or spanish delicacies we should try during our stay. They were very forthcoming!
Tldr: I HIGHLY recommend staying with Barbara and Ian. They are amazing people, the appartment is beautiful and its location is phenomenal.
Thanks for having us and hope to stay with you again, it was a pleasure.