Our stay at Ignacio's appartment was just perfect.
The appartment itself was very charming. It was very clean, had space, towels, a hairdryer, WiFi, a coffee Maschine, an air con of you need and a nice view from the Windows. It's on the highest floor in the house.
The location was very good (right at the opera). We could do everything by foot from there. The retiro is not and Malasaña is also in walking distance. For me as a runner it was perfect as the casa del Campo (a Park) is just nearby.
Ignacio was very friendly and helpful. He responded quickly and was available on phone. Lilly, who gave us the keys, was also nice.
All together it was a beautiful stay. If you are travelling to Madrid we can only recommend the place.