As for understanding the language as a beginner, this one is quite good. There is some gangster jargon and bad words, but frankly the English subtitles have more American gangster jargon than the French probably does. The speech is very clear, which is amazing since the film is largely made in the outdoors with a background of train whistles, traffic and strong winds. I like to view old French films in part because, as in this case, one can see what Marseilles, Paris, and Provence looked like in 1958. The film feels very authentic.
My homework is done... I can go out and play now.