Le Brin de Zinc is a traditional French bistro in the old quarter, serving classic dishes — steak tartare, duck confit, seasonal vegetables — in a room with exposed beams and the warm atmosphere of a place that has been doing this for years. It is popular with local regulars, which is usually a good sign.
The wine list favours Loire Valley producers, which makes sense given the location: Sancerre and Muscadet are well represented, and the house red is a decent Chinon. Prices are moderate by French restaurant standards and very reasonable by the standards of Loire Valley tourist destinations further west.