This is a very nice, stylish place, in a convenient location. The space is exactly as pictured in the listing, with three rooms - bed, bath, kitchen - and balcony. The unit is in the back of the building, so there is no noise from the street. The kitchen has all the basics (frying pan, small sauce pan, plates, cups, glasses, utensils), but isn't equipped for larger meals. The bed is comfortable, and there is an extra blanket for colder nights. The wi-fi is speedy and works well.
The location is good - close to the metro (Alvarado and Estrecho stations), grocery and convenience stores, and there are several local bar/restaurants (I liked 'El Alamo') within a couple-block radius. On the main road (C/ Bravo Murillo) there are chain restaurants (KFC, Subway, Dunkin Donuts, Burger King, etc.) within an easy walk. A large 24-hour Carrefour is one metro stop (or a 10-15 minute walk) away at the Cuatro Caminos metro station.
I enjoyed my stay, and Mirela was a great host - providing check in, help, and advice. I would recommend bringing ear plugs for sleeping, as noise/conversations can be easily heard from adjoining rooms, hallway, and stairwell.
I definitely recommend this place, and it was great for my stay in Madrid.