We arrived by plane. The taxi driver had trouble finding the address despite Google Maps on my mobile phone. The ride was more expensive than I thought. I recommend everyone to travel to the apartment by train. It's easy to find and doesn't take too long.
Fernando already met us on the street, he lives around the corner. Fernando was super nice. He explained everything to us and was very obliging. He spoke very good English, so that everything was understandable for us.
We stayed because of a concert in Madrid and Fernando provided us later in the evening with information how to get to the area of the concert and how to get back in the evening. He sent us pages from the internet and printed out a map. That's really more than you can ask for. We were thrilled.
The apartment was clean, the bathroom was clean and the beds very comfortable. We had a good time there and would definitely go back to the apartment for a few days. Thank you Fernando!