I highly recommend this apartment. It has some extremely valuable features:
1) Marvelous location: very central, walking distance to most places of interest in Madrid, yet in a very quiet pedestrian street.
2) Perfect set up: full of light during the day, but dark and quiet at night. Fully equipped department, with everything you may need to cook, basic essentials provided, good bed, good shower, excellent WIFI, a friendly and responsive owner, etc.
Minor details that may not be ideal for some people: 1) No elevator, but it is only one floor up the stairs. 2) Somewhat weak air conditioning in the living room. It was not potent enough to cool the room in the hottest days of July, but would be just fine with any other type of weather. There is a second air conditioning in the bedroom, which worked much better.
Overall, we loved the place and had a great time there. It was great value for the money!!