We stayed in Emilio's apartment for 4 nights in early June and had a fantastic stay!
The apartment was precisely as described and was lots of space for 2 people. It was in a great, central location on a lively street full of bars and restaurants just steps from Puerto del Sol. I would only say that if you are a light sleeper or go to bed early and want it to be very quiet, this might be too busy a location for you. We thought the area was exciting and added to our experience.
Emilio was wonderful to communicate with and was very helpful. Ask him for dinner recommendations and make sure to eat at a couple of his must-tries, we had 2 great meals at restaurants he suggested.
We would certainly stay here again if we return to Madrid. Thanks Emilio!