Good location, nice host, comfortable house.
I can't explain this apartment with only these words.
This apartment is really close to Metro, plazas, museums, and shopping area. There are several department stores, brand shops, and supermarkets around here. The host, Roberto, prepared a guide paper for you. (good restaurant, supermarket, museums, and some tips for you) He is really nice, kind and humorous. He responded fast when I asked about rooms. Even the housekeeper of this apartment was really nice. She recommended good places to go. I think you have to stay here if you stay in Madrid.
The metro station of this apartment is Serrano. It is near to plaza de Sol, Atocha train station. Oh, you can go to bull fight stadium in 15 minutes from here by bus. Anyway, it is the best place to stay in Madrid.