This is truly a bom bom in the heart of Madrid, the location is incredible, the place is a small and cozy top floor apartment inside an old building facing the church, the host was incredibly friendly, knowledgeable and willing to make our stay a pleasant one, she was even flexible with the check in and check out schedule, she was also available on the phone for any questions regarding the city, food, museums or apartment. The apartment has a little balcony for the morning coffee with an inspiring view, low ceilings in some areas so watch out if you are tall. The place is on the 4th floor of an old building with no elevator, 63 steps to be more precise (host said they are working on installing elevators, they are needed) so if you are carrying a 50lb bag you will get a work out daily.
I would highly recommend the place, it is centrally located, near a market, supermarkets, drug stores, and the palace...