I'm a continual experimenter with essential oils and vinegar. My husband can pretty much expect that my solutions to almost every household problem will include vinegar. But, surprisingly, my air freshening tips do not.
While I was perusing in the book store last week, I stumbled upon this little gem: Put a few drops of essential oil on a cotton ball and place it in your vacuum cleaner bag. Every time you vacuum it will freshen the room. (I don't remember what book I was perusing. I'm pretty sure it was published by Reader's Digest.) I tried it. It works. I put about 5 drops of eucalyptus essential oil on a cotton ball, stuffed it in a new bag (it was time to change it anyway,) and started vacuuming. The whole room smelled glorious.
My other smell freshening tip is simple. Get a spray bottle. Fill it with water. Drop in a few or more drops of your favorite essential oils. (Mine are lavender, eucalyptus and peppermint.) Spray when the need arises. One thing I will say about this natural alternative: it doesn't hang in the air for long, but it does clear out a bad smell.