Generally it was a very good stay, accurate to the description.
The windows look to a cute side street (C. Don Felipe) and the main entrance is from a nice and busy plaza at the hearth of Malasaña.
People who work for this Airbnb were friendly and commutative and helped me when I needed. Thanks to them!
Warm water in the shower is enough if you're one person, or if two people take quick showers after each other without using too much warm water. After you use the warm water you have to wait some hours for it to reheat itself - probably it's a preheater system with a water tank or sth. Generally this shouldn't be a problem though. Shower and kitchen equipments are enough and working fine.
The busy plaza can be loud on weekend nights and if you're visiting in summer there might be some noise coming in from open windows, but this shouldn't be a big problem if you're not very sensitive to noise. In the month of April this was not an issue for me and I was able to sleep well.