Q: Is it still a good idea to add pleasant odors (cookies baking, cinnamon, fresh flowers) to a staged home for showings?
A: Not necessarily. Odors do matter, but assuming you know what "a nice smell" is to you buyers could be trouble.
If anything, the house should smell freshly cleaned, but not "chemical." Your best bet is to focus on eliminating foul or dominant odors. If the house smells stuffy or "closed up" (you know, that "back of the closet with coats from 1974 smell"), concentrate on circulating fresh air first and foremost. Replacing air filters in forced heat/air systems is a good place to start.
The trouble with adding odors such as baking cookies or fresh coffee is one of preference. How do you know what sort of associations buyers will have with the smells you think are attractive? Floral scents may even set off allergies.
Not to mention, you may be adding a "good smell" in an effort to cover up a bad smell. We all know how well that works out.
Finally, many buyers are aware of the "sweet smell" tactic associated with open houses. While your intentions may be good, some savvy prospects may be thinking, "I wonder what that smell is supposed to distract us from?"