The apartment is located at one of the best areas in Madrid. It's small but perfect for 1 or 2 people( just be prepared to climb a lot stairs:D) .
Everything was clean and tidy.
There are a lot of cafes and restaurants nearby. It is just a few meters from Puerta del Sol. At night it's a bit noisy though , due to the central location.
Carlos (the host) was very friendly and supportive.
I'll definitely recommend the apartment to others. :)