Mercedes is a wonderful host and her apartment is spotless and well appointed and very comfortable. It's also a perfect base for exploring Madrid: A nice stroll through Retiro and you're at the Paseo del Prado and Bario de las Letras. Or walk down Alcala and you're soon at Gran Via and Chueca. There is the added bonus of exploring Madrid's less touristy neighborhoods, such as Salamanca and especially Ibiza just east of Retiro. The apartment is also close to Metro stops, but don't wast time beneath Madrid when the walks in all directions are so enjoyable.
We highly recommend Mercedes' cozy Retiro apartment.