Hostelling International Ottawa: in the heart of the market!:
http://HIHostels.ca/Ottawa
Carleton University: closest and cheapest!:
http://www2.carleton.ca/housing/
Bed and Breakfasts: relax!:
http://www.bythewaybb.com/
http://www.rosebandb.com/
http://www.ambiancebandb.com
Conference hotel:
http://www.victoriapark.com/hotel_overview/