Guillermo's place was great. We were greeted by his friend Antonio who helped us carry our luggage up the stairs. The place was clean and cozy with a nice AC system. Things to note: this is a non elevator building with five flights of stairs. It didn't bother me, but just an FYI. Guillermo and Antonio were responsive, friendly and helpful. I also really enjoyed the neighborhood, Lavapies. It was a centralized location and gave me a real feel for Madrid.