"It seems that Picasso, Hemingway, and the rest of that crowd didn’t spend much time at home. When they weren’t killing hours at the Flore or the Deux Magots, they were at the Rotunde in Montparnasse. The café, which retains much of its original charm, opened in 1911, and, as the story goes, the proprietor let starving artists nurse a coffee all day, looked the other way when they snapped off the end of a baguette and shoved it in a hungry mouth, and best of all, allowed them pay with paintings when they had no cash. The payment policy has changed (anyway, face it, you’re no Picasso) but you should go anyway."
A Guide to the Most Iconic Cafés in Paris