We had a great stay at Rafael's flat. It was very clean and well maintained. The location is extremely convenient — very close to the Prado and Reina Sofia and walking distance to the Plaza Mayor. The neighborhood is great, with a lot of nice restaurants, cafes and bars.
Rafael is very responsive and I was able to get in touch with him very easily. He left detailed instructions for the wifi, washer, etc, and made key pickup and drop off very easy.