My mother loved Cafe de la Paix in the Intercontinental Grande.

I like Cafe Nemours in Place Colette at the end of Avenue Opera, behind the Louvre. It is great for people watching.

Thin🐩

Thanks so much for the ideas. I've added them to my list.
We did eat at Cafe de la Paix during my first visit to Paris. So hard to believe that was 15 years ago. How can that be?!