It takes around 10 mins walk from Atocha Railway Station.
Clean and safe neighbourhood.

The apartment itself seems recently built or renovated.
And there are other guests staying in this apartment.
The room has two single beds, one desk and chair, and a big closet.
Although I stayed only one night to catch my flight departing from Madrid, the host was very welcoming and kind.
I think it's best for the travellers looking for a cheap but still new and clean room :)