This is an absolutely beautiful apartment and a perfect location from which to explore Madrid.
It’s very central, right next to the Plaza de Oriente and Palacio Real. There is a small convenience store and a bar/ cafe on the same road. It’s very near Opera metro station and less than half an hour by taxi (30€) from the airport. You can walk to the Prado/ galleries area in less than half an hour, too.
The flat has excellent facilities, including washing machine and dishwasher - it’s also remarkably quiet, given its central location. Rooms are comfortable, and the living space is large and beautifully decorated.
Cristina was very helpful and answered my questions very promptly. We had the perfect weekend in her apartment and I hope we’ll return one day.