We had a great stay at ulises's sweet little apartment! He made us feel very welcome and comfortable; the walls are literally lined with pamphlets, maps, and guides about Madrid that you can use. He also gave us a great restaurant recommendation! My only small complaint was that the bed was not super comfortable. And this wasn't an issue for us, but good info for others maybe: there are a lot of stairs (four flights) and they are very old and slippery. But overall we had a great experience!