I have my Paris bistro list pretty well set and am now looking for one or two change of pace meals, specifically Vietnamese and burgers. Considering Foyer Mon Vietnam and Au Coin des Gourmets for Vietnamese. For burgers am looking at Razowski's, Big Ferdinand and Coffee Parisien. Anyone eaten at these places? Are these decent choices? We're staying in St. Germain district so these seem conveniently located. Thanks for your help.