Conchi's apartment was exceptionally clean and very quiet, close to a good bread shop (turn left, and go down two/three streets) for breakfast, and a good, modest market. It is very close to the lovely El Retiro Park, and also Atocha rail station (which was helpful for our onward journey to Cuenca). Conchi couldn't meet us herself, but we had a warm welcome from her husband. Arriving after 8PM at the airport we didn't have time to get to Conchi's by public transport, but there is a truly excellent taxi service, with a (currently) standard charge of 30 euros to anywhere in Madrid. We would highly recommend staying here.