It was a big pleasure to meet Blanca and Maria and of course to stay at their apartament :) They are super nice, friendly and helpful. They recommended us places to visit and activities during our stay in Madrid. The location is great, you can reach the city center by your feet (there is metro station near the apartament, so don't worry if you don't like to walk).
If you want to stay in the best place in Madrid, better hurry up, because I'm gonna recommend it to all my friends! :) Totally recommend and miss already.