These "Cafés" or "cafeterias", were places where guys hanged out to watch a soccer game, talk bout politics, etc, kinda like a Pub in the U.K.
They serve the Italian and french style coffees served in small cups called "demi tasse"opposed to the north American watered down versions.

A typical example of these coffee shops in Buenos Aires is the cafe Rivas located in San telmo neighbourhood at the corner of Estados Unidos and Balcarce streets. With its vintage looks and stategically located with a vantage view of the intersection, you can stop by for a fast espresso or"cortado" (espresso with a shot of Milk) or eat lunch or dinner. These places are opened all day long, except on Mondays.