Great music (I think the DJ is Daniel Borelli), a fast wooden floor, and a room fairly easy to see across.
Only a few people younger than 60, though.
This is in a large old hall, the Leonessa. It's a beatiful floor, the best in Buenos Aires in my experience. Smooth wood, but not slick, and it feels sprung. It is undergoing renovation -- they had only one chacarera instead of two, because stomping would knock plaster off the ceiling in the floor below the dance hall.
It is probably my favorite milonga here, but I only give 4 stars because it won't be to everyone's taste. It's an older crowd, and the dancing reflects that -- beautiful, from the heart, but no longer as athletic or new. I love it, but not everyone will.