Great apartment. The location is unbeatable, and it’s exactly as described in the ad.
I would just ad that if you are coming to Madrid in very hot days, the lack of A.C. might be an issue for you, so be forewarned. Also, as the ad says, the apartment windows face internal patios in the building, and at times it can get noisy early in the night. You will catch neighbors’ conversations, screams, and other noises.
Other than that, we really recommend the apartment. It’s truly a gem.