A great location! All the tourists spots were within a 15 minute walk distance and there's also a lot of food places nearby. The only downside was that you could hear people in the corridor, but it was easy to ignore after a while.
We didn't meet Gianni in person as he was in Italy, but he made sure to message to see if we got to Madrid ok and how our stay was before we left. He even suggested places to go for food on our last night. Great host!