For European / "continental breakfast", or lunch, or coffee/tea & snacks, with first class quality bakery and gourmet cheeses, delicattessen stuff, mousse, croissants, light or rich deserts, etc, etc... casual but comfortable tables, relaxing lighting, eat in or take out, the food is very top quality, heavenly, but reasonable or cheap prices... Le Boulanger Francais The French Baker
119 Murray Street
Ottawa, ONT (Byward market area / Bytown)
check the map and someone else's review on google.ca
For Dinner, if you want to try something new and different,
try the restaurant called "Sweetgrass", 108 Murray Street, fine dining at moderate prices, actually some of the foods of the first people to inhabit this land.
(PS- Avoid the hotel restaurants, the service at the hotel restaurant was extremely slow.)