In lieu of candles, we've always used a few of the vanilla-scented plug-in air fresheners placed throughout the house. Smells like baking food without any danger of fire. And you don't have to do the work of actually baking anything.
We also open all blinds/curtains and/or turn on all lights so that the house looks as large and open as possible.
When I'm looking at the inside of a house, a house that is clean, decluttered and well-maintained has a better impact on me than anything else.
We've always tried to leave when someone was coming for a showing. With our last house, we had two young children and rather than deal with showing while we were in town, we cleaned the house and took the kids on vacation for a week. We'd let the realtor know ahead of time so that she could get as many people through the house as possible and we had the house priced appropriately to sell quickly. We had an acceptable contract ready to sign when we got home. I highly recommend this tactic to anyone with kids.
I have no idea why anyone would have gone through the OPs papers or emptied the coffee pot.

Personally, I always put personal papers, jewelry, etc. in a lock box when the house is being shown.
Good luck with selling your house! I hope it sells quickly.
