6.0 G. IV, 3, rue Poissonniere in the 2nd, 09.81.35.30.45, (Metro: Sentier), closed Mondays but brunch Sundays, is temporarily buried in scaffolding, but underneath, a really cool, clean, wine-bottle and epicerie-jar filled eat in/take-out place that clearly already has captured the hearts and palates of the folks who work in this transitional area. The name - G. IV - well, it depends who you ask. The guy who served me said his name was Georges and he was of many such named in a large family - the other waitguy told my dining partner that he had no idea why it was called that.
My friend ordered up the duck with a mound of sliced carrots and big salad (she felt the duck needed some ooompf, and borrowed some of my mustard, I disagreed); I had the pot-au-feu, not on the ardoise, which I found quite delightful and we shared the tiramisu (it was also quite pleasant).
Our bill, with a bottle of wine, quite nice bread and 2 coffees, was 48 E for the two of us. dB =76.6.
Go? This is another place that's not a destination for visitors, but for folks working in the high-tech, architecture, design businesses nearby, it's delightful and reasonable.