Ana's place is great and it's in the most beautiful area of Madrid – at least if you're young and want to experience life as locals do. Despite being in the action, the street is super quiet so you can sleep pretty well – the only downside is that walls are quite thin so you might hear the neighbours early in the morning (bring earplugs).
Ana and her husband are very nice people and they're guide to Madrid has been very useful on many occasions. We'd definitely recommend a friend to stay at their place.