Another vote for the Sheraton Eau Claire. It really is nice to have a separate sitting/living room as well as a bedroom on longer stays. Also, ask about Lounge access, as their Lounge used to be quite nice and a great place to visit after a work day. (Haven't stayed there for a while though....) I liked the location because it was much quieter than some of the downtown construction zones, but that seems to change so quickly in DT Calgary.

The last time I stayed at the Hyatt (late June, early July) there was so much construction and road work and road blockages that it was a real pain to drive in and out.