Le Champ de Mars is in a very nice residential neighborhood within walking distance of the Eiffel Tower.
This place, the Champ de Mars in the Seventh Arrondissement, is very close to the park of the same name, the Ecole Militaire, and, as you can see, the Eiffel Tower. It's a big place with great sun exposure and a terrific menu that's reasonably priced (or used to be; still, it's not cheap). Even though it's often filled with tourists, the Champ de Mars is an authentic Parisian brasserie/café that serves a robust Parisian crowd, and I've enjoyed many great meals there. The people watching can't be beat.
If anyone has been recently, I'd love to hear what you thought and what it's like these days.