The apartment was great! Simple, but mostly everything you need. The best thing about it, is it's location in Calle de las Huertas. Really near the lovely Retiro park and cafes and restaurants in the street. It's close to the city center and a perfect starting point for a walking tour. Because the apartment is at the back of the building, there's no noise. We slept very well, also the bed was fine!
Hopefully Wi-Fi connection can get better, but other than that we enjoyed our stay and will definitely book it again for a next trip to Madrid.