The position of the apartment is perfect, right next to Puerta del Sol. The apartment is big and we'll equipped. Bathroom a bit small but functional.
The sofabed was not so comfortable, while the other two beds yes.
We had problems with WiFi not working very well that wasn't solved (but we stayed only 3 days and was weekend). We were not provided with 3 towels since we were 3 people.
We also have been very unlucky since the lift broke and it was 5th floor and weekend so it wasn't repaired while we stayed there.