Kristian is a really nice & flexible host, he gave us tips and also helped us where we can store our luggage until our flight. His place is really in the city center, only 5 minutes walk from two metro stations and almost every main sight is accessible by foot - we've rarely used public transport during our 4 day stay. Kristian's place is really nice & cosy, we've enjoyed staying at his place. We would definitely recommend if you're looking for a central place in Madrid.