Ana's place is in an amazing location. It is not only close to all that Roma and Condesa have to offer, but it is literally around the corner from some amazing street food (hamburguesas, tacos, quesadillas). It's also a short cab ride to Centro Historico and a few blocks from Arena Mexico. Ana was also a great host. The check-in process was flawless and she welcomed us with pastries, fresh fruits and beers in the fridge.
The only downside, which a few people raised, is that it can get really noisy. Although in an alley, the walls of the apartment are paper thin and a neighbor blasting music on Saturday night kept us awake well into the night. Add to this the noise of people walking upstairs and even with earplugs, it doesn't make for the most restful stay.
Overall, we had a great stay, but if you are a light sleeper, consider yourself warned.