The apartment is lovely and located in the heart of Madrid. It's easily walkable to a variety of neighborhoods and tourist attractions. Consuelo is very quick to respond (in either English or Spanish) and kindly left a bottle of wine and cheese and chips to greet me. The apartment is just like in the pictures--cute and small and very clean. It is on the fourth floor, so be prepared for some stairs. There was one minor maintenance issue, and Consuelo's husband came over immediately to fix it. He and Consuelo work at a store several floors underneath the apartment and were great hosts.
I would highly recommend this apartment to anyone who wants to explore Madrid.