The best thing about the apartment is the location; it is close to everything, you can almost walk everywhere from there.
It is the perfect spot for a few days in Madrid, compact, but with everything you could need during a short visit. The views were beautiful, and the place was so quiet you couldn't hear a thing!
The communication was straightforward, and Andrés was welcoming and friendly even when we arrived a few minutes earlier than planned! He was always available and answered very quickly.
The only downside for us was that it was cold even with the heating on, so if you are visiting in winter, make sure you pack a good pair of super warm socks! :D
However, we would definitely come back!