Sergio is the best host! His flat is in a great location right in the center and near everything you can possibly want. There are many bars, stores, and restaurants right outside of the flat. Plaza mayor and sol are about a 5 minute walk. He also showed me all around Madrid and suggested great places to visit. I didn't even need a map afterwards. Best local guide one can ask for! The flat is quite modern with a lot of light. The room was great with a very comfortable double bed. There are many metro stops near by but everything is so close you can basically walk everywhere and explore the city. Sergio is a very friendly host. He was always up for having coffee and showing me around. He made me feel very comfortable like if I were in my own home talking with a friend.