Chez Janou is one of my favourite restaurants in Paris. They serve authentic French food and the restaurant has a relaxed and colourful interior. It's always packed so make a reservation if you can. Otherwise, it's worth trying to do a walk-in.
A very popular French bistro, not too far from the Eiffel Tower. The menu is very French, a little pricey, but the quality of the food is excellent. Make sure you have a reservation or arrive early to avoid a long wait.
Cozy restaurant in le Marais. They serve French food with a bit of an Asian fusion twist, which makes it slightly different from the usual French restaurants.