Regarding apartment: very clean, stylish, has everything you might need: beddings, kitchenware, towel and so on, everything!
Neighborhood: beautiful and peaceful Villa de Gracia is couple blocks away from Sagrada Familia, has many small supermarkets, restaurants and bars.
Host: Luis is wonderful host, very helpful, explained everything and gave very good tips and advices. If I ever have to visit Barcelona again (hopefully), I will definitely contact Luis for the place to stay.