We had a fantastic stay in Madrid at Marco's flat. Needless to say that it is well-located and you can visit many of Madrid landmarks on foot. The flat was spacious and well furnished. It had all amenities you need in a flat to make your stay as pleasant as possible. The check-in process is hassle-free and key-less which makes the experience even better. There were some instances where we could hear noises coming from other flats, but it did not affect us too much. We would consider using this flat again when returning to Madrid.