we are going to Montreal for 1 week in early Sept. Any thoughts about going to Quebec city for a day or two? What would be the best way to get there? any suggestions as to which neighborhoods to look for a hotel or B&B in Quebec city?
Try the Hotel Relais Charles-Alexandre on Grande-Allée E in Quebec City. It's within walking distance of Vieux-Québec. Nice Inn with caracter, breakfast included. 
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Montreal- to Quebec City- need a car or take train/ bus- try to stay In Vieux-Québec- Quebec City is small- you can walk all over- check out tripadvisor for where to stay- have fun
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Jillian