The apartment is perfectly located, close to all the interesting areas and attractions. I didn't get to meet Ulises, but he made everything very simple to pick up the keys and was extremely available and easy to reach throughout my stay. I traveled alone and the apartment was a perfect size, very clean and well equipped.
Perfect place to stay while in Madrid, especially if you don't mind the 88 steps to go up to the apartment :)

Highly recommended and would stay there again - Make sure you try the croissant at the little cafeteria next door!