Great place to stay!
Most importantly, the apt is in the best location one can ask for - in the heart of malasania, next door to so many cool bars and restaurants and literally 30 meters from Gran via. Callao and gran via metro stations are 2 minutes walk as well.
The place was immaculate and very tidy, and also have anything you need in case you feel like cooking / iron / washing machine..
The living room is comfy, and the bedroom, toilet, kitchen are separate.
It is almost on ground floor so you'll hear some people talking in the street at night and see them if you open windows, but nothing to worry about though..