This is a true budget choice in Madrid. The room is basic and gets very hot in the summer. The towels felt like sandpaper and the wifi was slow.
It's important to note that this is NOT a private room in an apartment, but a sort of Airbnb hotel where there are 10+ guests all staying in the same building - a rundown brownstone where the buzzer/doorbell is punched out.
Check-in was a nightmare too. Edu did not respond to multiple messages on the app and the buzzer didn't work so we had to wait out in a McDonalds for 2 hours. When we finally returned, other guests were also huddled outside waiting to get in.
Overall, one of the worst Airbnb experiences I've had (I've stayed in 50+ around the world). Would not recommend unless you have no other options.