This is almost a must-stop place if you're in Epernay. Decent sized bar, a lot of comfy chairs, and…read morelots of small production, local Champagne. What's not to like?
Get the daily tasting with 6 Champagnes, 3 rose and 3 white. It's served with salty snacks such as potato chips, olives, etc. plus you can also order food off a limited "appetizer" menu. Portions are large so you'll want to share, but everything looked great. It's definitely a pre-dinner place and everyone seems to disappear around dinner time, but you could make a meal of the food here pretty easily.
Check out the cellar and buy some Champagne if you wish, but if you're staying in Epernay you've got to stop here for a glass or more.