This place is a dump; it's an underground little basement where I found insects in the bed.
They also have a very useless system, that u need to send a message with your mobile phone to go to the bathroom (it's a bathroom shared between about 10 rooms in the same basement) and going back to your room, every time, you need to go to their website and press 2 buttons in your phone to enter the room. No human interaction/reception, They DONT provide keys or card; I ask for it, and they respond me I should b taking care of my phone as if they were my keys, but hey, keys dont have a battery that could finish, to make it work. It's Insecure and Dangerous for the guest. By excuse of covid or trying to be modern, remember if u book this place, u take the risk of going to shower and be exposed to other guests if u forgot your phone.
the area is center of Madrid, but its a military/administration area, so there isnt any proper shops / restaurants in the area around.
I d say its not worth it, and to book elsewhere, plenty of better choices in Madrid!