I've really enjoyed my stay in Santiago's place. He is a nice and helpful host.
The flat is very centrally located so it facilitates moving around the city. You can easyly get to all the main sights and night life spots by foot!
The flat is huge and perfect for people who seek authentic, stylish place "with a soul". Even though it's still in a process of renovation and needs some polishing, I sincerely recommand it as a perfect place to stay in Madrid.