The apartment is a fantastic big modern space with great facilities and an outdoor terrace which is a great plus on a lovely summers evening. It is about a 25 minute walk from Plaza Mayor (central Madrid) and a stones throw away from Retiro Park which is a lovely place to visit. It is also right by a train station with a direct train to Toledo taking about 35 mins.
Sergio was very helpful and quick to respond to messages. Would definitely book the apartment again!