Location, location, location! This apartment have the best location in center of Madrid, we stayed for 3 nights, 6th floor but have elevator, even when Madrid center is busy at night the apartment is quiet and you can have a good sleep. Be aware that you need to pick up keys in another location close to the apartment, if you have lot of luggage go directly to the apartment and then walk to pick up the keys. Great communication from host. Will stay again.