Mercedes is one of the best Airbnb hosts I have had. Her apartment is situated in the heart of Madrid, walking distance to most popular attractions and with easy access to public transportation for those areas that you might want to visit that may be a bit further away. She is located a mere 8 minute walk from the Madrid-Atocha train station and I could not have asked for a better prime location to stay. Mercedes is incredibly kind, funny, welcoming and has the best tips for maximizing your time in the city. Highly recommend!