The apartment is good and located in the central part of Madrid, close enough to various attractions and cafes of the city.
The bathroom is really tiny, but clean enough.
I can not help but notice a large number of rules that you will be reminded of often (sometimes too much communication).
Also, not very convenient that there is no key locker in the apartment and you need to agree in advance with the service about your arrival (there is a fee for late arrival).