I hear good things about contennial. The Hotel Concord may be a little higher in cost but being on mainstreet may be nice if you do not have a way to get around. Good coffee and food on mainstreet. If you enjoy coffee, I would recommend Revelstoke, their coffee is great. There is also "Tru" I think owned by Hilton that is fairly new and not far from the center of Concord.

Hope you have a nice stay!