I think everything has been said what there is to say about this apartment. It is in an amazing location right next to the Plaza and everything you need is right on your doorstep.
The flat itself is clean and tidy and has everything you need for a short stay in the city. The balcony is a fantastic feature and allows for lazy afternoons and evenings watching the world go by.
I hope to visit Madrid again and this flat will be my first port of call for a place to stay that is for sure.