Located a minutes walk away from one of Madrid’s many main streets (pharmacy, food shops, McDonald’s etc) but still tucked away so it is quiet.
The bathroom is incredibly spacious like a hotel with amenities provided. The main bedroom/couch area is lacking from much visible light - but unless you’re planning to sit about in your bedroom this is hardly an issue & it is comfortable, no issues with WiFi etc and all neighboring rooms were respectfully quiet during all hours I was there. There is a shared kitchen area if required.
Raul/Edu are quick with responses - I experienced no issues that required them.
Lastly I highly recommend using Callao metro station to go south or East to the plazas and museums (1.5e each way ~3 mins travel)..... Madrid city is deceivingly sprawling for sight seeing the neighborhoods/tourist spots & easy to burn yourself out walking.
PS Madrid airport is a little unclear to find the metro station. If flying into T1, it is a good 10-15 min walk inside the airport.