O'Brazil 40 rue Sant-Georges
Open everyday until 1am. This is a fascinating restaurant, with a wide range of dishes I never even knew existed in Brazil. A bit pricy, though I've heard it is worth it. Again the pervading problems of a restaurant in Rennes is that it is small. It is also a cyber-restaurant, I can imagine you munching away on one of their beef specialities, while surfing the Internet. Just, don't let your food go cold.