Opposite Cathedral in South part of Madrid so away from main tourist sites.
This hotel has a modern outside and underground car parking but at 12 euros per space was expensive. The rooms are dated 1970's chintz with full drop roller shutters to keep out the sun but even the secondary fit glazing didn't cut out the noise of the bar below, the street prostitutes shouting to each other followed by the early morning cleaners arguing at the top of their voices as they waited for the bus.
The airconditioning didn't work which made being battened down in the room even worse.
The breakfast was non existent in the cafe affair attached to the hotel.
All in all basic, turn up, don't sleep, don't eat then leave.
HRC stands for Hotel Reyes Catolicas (Catholic King Hotel) there are several in Spain but I don't know how they compare.