If you decide to eat at Polidor - watch Midnight in Paris before you go! Polidor features in that film!
https://en.wikipedia.org/wiki/Polidor
You could also eat closer to the Eiffel Tower. One of the googlemap walking routes takes you by La Terrasse at the corner of Avenue de la Motte-Piquet and Avenue Bosquet.
If you walk the route along Rue de Grenelle you'll also go past the Le Roussillon at the corner of Rue de Grenelle and Rue Cler plus any number of other restaurants. I also like the Italian restaurant Gusto Italia on Rue de Grenelle almost to Avenue de la Bourdonnais. There are 2 across the street from each other. I prefer the more restaurant-y one which would be on your left as opposed to the more carry-out one on the corner on the right. Food is good either place.
PS Watch Midnight in Paris anyway! I'm neither an Owen Wilson or Woody Allen fan and I love this film!
PPS I've walked from the Odeon area to the Rue Cler area many times and it's not a bad walk, depending on how tired/jet lagged you are. If you are tired, Metro Line 10 from Odeon stop will take you to the Motte-Picquet stop which is near the ET.