My wife and I spent three nights in Raquel's place. We were impressed by the space when we first arrived as it was larger than we had expected. Raquel was there to give us a quick tour as well as give us a recommendation on a nearby bar that had the best tortilla española we'd ever had.
The location was great - less than 10 minutes walking to Puerta del Sol and La Fuente Cibeles. Around 15 to the Prado art museum. I will definitely look this place up again next time I come to Madrid!