Buenos Aires is no longer on my radar. It used to be a city where a traveler could feel at home.
Going to café Tortoni was most disillusioning. The steak felt like it had been cooked in a microwave and the service was the worst I've had in quite some time. Billed as the oldest and best café in the city, I would not recommend going even though most travel guides probably rave about it.
Too expensive now for what used to be a budget city. Plus they charge a $140 entrance reciprocity at the airport, so don't fly in.