Very nice apartment with a practical location next to Atocha station, Reina Sofia museum and great bars and restaurants.
It was spotless clean with a very nice decoration.
Santiago was also a great host.
Please be aware that the apartment does not have any air conditioning units which may be an issue in the hotter summer months in Madrid. It is also on a 3rd floor with no elevator unit.
Otherwise we had a great stay in Santiagos unit.