I had a great experience at Ana's place. I would recommend it for people travelling alone or as a couple, as the apartment is quite small but has everything one or two people would need. It is centrally located between the two main tourist heart of Madrid, the museums area and the old city center, both of which are about a 10-15 min walk in each direction or short metro ride. The apartment is just a block away from the Lavapies metro station, where there is also a supermaket where you can get anything you'd need. Both Ana and David were very helpful for information about the neighborhood and city.