When I arrived at the apartment Ana was there and I met her, she is very kind and she is a beautiful girl too ;-)
Ana showed me the apartment that is exactly as described.
She accepted my request of early check-in and late check-out.
The neighborhood is nice, the apartment is very closed to the Prado Museum and Parque del Retiro, to the very center, Atocha's railway and underground's stations.
Ana was a nice and discreet host.
Thanks again.