Sofia was very helpful, and always in contact with me, asking me if I needed anything.
The apartment is compact, well furnished with what I could need during my stay. It is in a fantastic location in Madrid, two blocks far from the Chueca metro stop, near a "Dia" shopping center and lots of eateries. I went to the Mercado de San Anton to have lunch and it was really nice.
I do recommend Sofia's apartment. Definitively if I will go back I will stay in the same place.