I have to say i like the Champs area, but as someone who travels to Paris on business 8 times a year (35+ Marroitt stays per year) it's not my favorite area and i had my worst Marriott experience there (let me just say the guarantee Marriott promises on your reservation does not apply if someone else is willing to pay up to extend a night or pay for late check-out). You can't get a French experience staying at the Champs - it just tries too hard to be identical to all the other Marriotts around the globe.
If you like steak at a reasonable price and of high quality, try Relias du Venice. It is located across from the RER station at Port Malliott.
Just get there before they open, before the lines get long!
A good salad, and the only thing on the menu is steak, with Pomme Frites, great time!
Other Paris threads to check
http://www.rewards-insiders.marriott.com/photoAlbums/1101 La Défense, Paris, France
SusanL (Renaissance Vendome)
Thanks & CDG to Renaissance Le Parc Trocadero (Renaissance Le Parc Trocadero)
Paris! "Never better!" (Arc d'Triomphe trip report)
Surprise (discussion on Paris sights & hotels)
Hotel and Metro in Paris (hotel airport transporation options)