Federico's place is in an unbeatably location, less than 5 minutes walk from Gran Via metro station and in the heart of the Chueca, with all its bars, restaurants and shops.
The apartment is really big with a spacious lounge with two sofas, a large dining table and a separate well equipped kitchen. It was very cold in Madrid when we visited but the apartment was very nicely heated.
Despite the fact that Chueca is a very lively neighbourhood, the bedroom faces the inside courtyard so there were no issues with street noise. I definitely recommend Federico's place.