Our apartment is on the lovely Ile St. Louis. Dining options are limited here, but one place that seems to work well for a casual lunch is the Auberge de la Reine Blance. It's just a bit further west up the street than most tourists go and the door is kind of small, but inside is a very typical little comfortable lunch joint.
The menu is a bit ambitious for a casual place. Ken had an eggplant gratin with curry flavouring along with a rich, solidly prepared beef burgundy. I had an excellent set of snails in little puff pastry with pesto and a lovely millefeuille preparation of fish. Well executed, simple, not terribly expensive. We'll be back.
We went back, it was as good as remembered and is now our favourite neighbourhood place. I see someone agrees with me: it gets a 21/30 food rating in Zagat.