Eva was very helpful & fast to respond to messages. The apartment is in a GREAT location, just steps away from the Metro, a supermarket in basement of Corte Inglès, a Valor Churreria, and many restaurants. 10min walk to the Opeta house Teatro Real, the Palace Palacio Réal, the Cathedral.
From the airport get the express bus €5 to Plaza Cibeles then walk (20mins down Gran Via), or local bus 146 Callao to Plaza Callao, or taxi. Or metro 2 stops from Banco España to Sol then change & 1 stop to Callao.
Going back to airport: metro from Callao 1 stop to Sol, change, 2 stops to Banco España, the AirPort Express bus leaves from just in front of the post office (Correos).
We would come back! Apartment is in GREAT location (on 6th floor with lifts) but be aware there may be noise from the Plaza Callao below.
Muchas Gracias, Eva!