The place is in a great location, it is right at the centre of Madrid, next to the Royal Palace. All the sights and restaurants are within walking distance.
The flat itself looks great and we had a very comfortable stay.
The hosts are great. They met us at the flat for our check in and were very responsive to our queries before and during our stay. I would also like to mention that the hosts were very flexible to our request to check out later than the original check out time.
But I would say the walls are quite thin, so you can hear the residents upstairs walking about. Also, as it is right next to the Royal Palace, so you can hear people outside late at night and first thing in the morning. However, this never affected our stay, but it may bother some people.
Overall, I would recommend this place.