My wife and I grabbed a quick, small lunch here after touring the Chateau, since it's basically…read moreadjacent. The café is accessed through a small, enclosed, outdoor seating area which I would have loved to use had the weather been better. The interior is cozy, with some interesting (but not obnoxious or distracting) music playing. Service was good and prices even better: a cheese plate, Nutella crepe, café crème, and beer came to 21.50 euro.
They also have a wine cellar which dates back to the 15th century which you can examine, which is a really cool thing if you're a history buff (and, if you're visiting Blois, there's a good chance you are).