A friend of mine once said, "When I read news stories about things I know about, I'm often astonished about how wrong the journalist is about even the most fundamental concepts - which makes me wonder why I should believe anything I read from that publication about things I *don't* know about".
On the other hand, we have Sally Blake's wonderful little book. In a relaxed, witty and non-judgmental style, she shares her hard-won lessons about her quest to find her own brand of tango happiness in the the intense Buenos Aires tango social scene. She pragmatically separates the available social tango opportunities into three broad (and somewhat overlapping) categories: "tourist-circuit", "traditional", and "informal", with seven recommended "try-here-first" venues in each category, and thorough information about each recommended venue. For a "tango immigrant" Britisher, her descriptions are refreshingly lacking in tango-fundamentalist dogma, and are nuanced enough to allow you to gauge your best bet for the evening along the lines of the practical, important distinctions: age of attendees, prevalent style of dancing, pace of crowding through the evening, etc.
Advice on the logistics of visiting Buenos Aires, the behavior codes in the milongas, any many other aspects of city life critically important to the tango visitor, appears very up-to-date. I know some of the vendors she recommends personally, and can vouch for many of her value judgments. Sally and I would probably see each other sometimes, and not every night, because our tastes and social circles are not exactly a perfect overlap - but her attitudes about aspects of the scene that are not always her preference are well-written and useful.
After just returning from my eighteenth trip to Buenos Aires, I can say that Sally's book passes the above "credibility test" with flying colors - her accuracy in describing parts of the scene I know about gives me great confidence in relying on her information about parts that are unfamiliar to me.