Du Lac, at Haarlemmerstraat 118, offers a very decent deal for students- a 50% reduction on food plus a free coffee (sometimes) with your meal. They have nice food, mostly Mediterranean-inspired including some vegetarian choices, and are open for both lunch (noon - 5PM) and dinner (until 1030PM). The style of the restaurant is art deco, and is pretty and pleasant. It also reminds me of a pub. Du Lac was once home to the weekly ISN borrels, and has a large basement with several rooms and a bar, usual open on the weekends. I've been to some special theme parties here and they were all right, kinda grimy downstairs though. The cheap food (with the real restaurant atmosphere- something missed by poor students) makes it worthwhile to come by, and the architecture is interesting enough too. Just make sure you do not forget your (Dutch) university identification. Afterwards, you can check out the bars in the Jordaan, where there is a wide selection of cool, small and very 'local' spots.