I'll second the proposal for the Welsh Pub. It's very traditional with waiters in waistcoats and long aprons, and the food is good too. If you want a smaller place with a more intimate atmosphere, Le Doyen, in rue Doyen, I think, a narrow street to the left if you stand with your back to the Welsh Pub. It's very small, only five or six tables, and run by a man who cooks and a woman who serves and does everything else.