I'm not quite sure why this is Cafe du Monde: it should be the Cafe du Paris!
Part of Le Groupe Restos Plaisirs, which also includes Le Cochon Dingue, Le Lapin Saute, and Jaune Tomate, Le Cafe du Monde is located on the waterfront, near Old Port. In nice weather, you can eat out on the balcony, or stay inside and watch the ships along the river.
Service in this restaurant was the best we'd experienced in Quebec (although that's actually not saying much).
I had the mussels trio - excellent! A dish each of mussels marinara, mussels Madagascar, and mussels Provencal were all very good.
We ordered the $1 truffles for dessert, but the waiter misunderstood and brought us the profiteroles with chocolate sauce, a delicious mistake! Go crazy with the chocolate sauce - we did! One lady was also having them as we left and asked for barely a drop of sauce! We didn't understand. :)