We have stayed in the apartment in February. Apartment has amazing location with 20 min walk to the central historical Madrid. The apartment was clean and perfectly prepared for our stay. You have small shops and cafes just around the corner. Host was very helpful with the check in information and instructions. All we can say - great apartment, great location, and great stay.
The only tiny minus is that the apartment doesn't have windows (only in one bedroom which cannot be opened). But this is not important, specially if you are spending all days out and about.