I had a fantastic time staying with Tati - she is a warm, kind and open host who went out of her way to help me navigate the city. Tati's apartment is fabulous and the pictures do not do it justice. The room is not the biggest but has everything you would need and more (drinking coffee on the private terrace was very nice). The bed is very comfortable and the private bathroom is very modern and clean.
The area is local and charming with lots of great restaurants and bars. It's a good base for exploring the city and away from all the usual tourist.
I would highly recommend Tati's apartment and hope to stay with her again next time I'm in BCN.