We were greeted at the train station by Nader, and we immediately taken by his friendliness and enthusiasm. He had arranged transportation to the apartment with a friend (for a nominal fee), and gave us a tour on the way. The neighborhood was busy but not filled with tourists as much with locals going about their daily lives. The apartment building was secure, well cared for, and had elevators and good stairs.
The apartment was very nice and well appointed. The kitchen was well equipped and though a bit small was easily serviceable.
There were plenty of linens, towels and cleaning supplies.
All systems worked very well (TV, A/C, etc) and all requests and questions were promptly responded to.
The location was excellent. Short walks to several Metro stations, a beautiful park nearby (Templo de Debod), and lots of small restaurants and shops.
This was an excellent location from which to explore Madrid and Nader was a perfect and responsive host.