If your train leaves in about an hour, call 06 73 08 54 13 and order in advance. Your table and your first course will be ready when you arrive, and our lunch service is already built around a realistic one-hour slot because the offices around here run on the same constraint.
And if you are carrying luggage, ask us on the same call. Whether we can accommodate a large case depends on how full the room is that day, and we would rather tell you than have you find out on arrival.
The rest of the practical detail, including the metro options and the Sundays we open, is on our visit page. If your timing is the awkward part, see eating in the afternoon, and for the wider picture there is our guide to eating out in Paris.