Tucked away down a side street just south of the town hall, and west of the rail station. French is the first language!!! so be prepared. I took my wife here for a birthday dinner in September 2013, and we were not disappointed. It was a quiet midweek evening, but service and quality of food were all excellent. With a smattering of our French and our waitress's ingenuity and few English words, we made our way through the menu - a rose finish served to describe the way my wife wanted her duck cooked. There is not an extensive menu selection, and I understand it changes regularly and seasonally, but what was on offer for us that evening was varied and adequate for most tastes. We ate and drank well, and did not feel our pockets had been emptied at the end.
One warning, that the current restaurant 'photo is incorrect and of their previous premises, having moved in to their new location (53 rue Auguste-Comte is correct) just a few months ago. I have uploaded my own (taken in the morning hence windows shut) which may help to identify it.
Well worth a visit for an authentic French meal.