The apartment has a great location, its just less than 5 minutes to the Plaza Real and you can discovery Madrid walking from there to the main attractions easier.
The apartment is great, has the a good internet, the kitchen has all the utensilies that you need to cook, the shower is good and the bed so comfortable. The neighbordhood has supermarkets, a lot of option to eat and so safety. I definitely stay in Gonzalo's apart in my next time in Madrid. Also, the communication with Gonzalo was great, always available to chat.