Time Out says
Marcel’s is the kind of restaurant that you’d expect to find on Pennsylvania Avenue: exquisite food, beautifully served in a sumptuous dining room by adept professionals. Chef Robert Wiedmaier’s Flemish-inflected French fare manages the classical balance of taste and textures: subtle versus sharp-flavored, savory versus sweet, generous versus leaving you wanting more. Boudin blanc with black mushroom truffle purée and truffle madeira sauce is exemplary, and a gratin of mussels with Chimay, salsify and bacon is a blast of intense flavors. The servers get extra points for friendliness: even if you’re not one of the place’s traditional, old-money clients, they’ll still treat you as if you were.