This is the best city apartment we have ever stayed in. The place is very clean, spacious (for a couple) and very well equipped with toiletries, kitchen items, extra beddings and towels. There were many little details that were unexpected but incredibly thoughtful like cheese and ham, milk and bread for breakfast or cotton buds and kleenex to take with you, and so many more. The location is perfect - you are right in the centre of Madrid but it was quiet at night.
Carlos was an excellent host! Very responsive throughout the trip and also offered recommendations when asked. Cannot recommend this place enough!