I’m sensitive to smells, so can’t use those items myself. They have very sensitive noses, so it would be hard to know if something bothers them, but imagine that they are much more likely to be aware of any added smells than you are. If you are just interested in making your room smell with a certain fragrance, I would not do it. A little perfume on yourself will give you a nice smell for you to enjoy without permeating the room with it.
But if you’re trying to mask the odor of the bunny’s stuff, then take a different approach. First, litter box odor is much more controlled by aspen pellets or shavings than any other litter. I love it, and my bunny is now in my folk’s kitchen/family room and never smells. Frequent changings of litter that is not aspen also solves a lot of the problem.
White vinegar/water washing eliminates odors from stained cages, toys and supplies. Rinse thoroughly because bunny won’t like that smell.
Coffee grinds and charcoal set in a room also absorb odors naturally without their own smell.
Nature’s Miracle is a great product for cutting odors and cleaning without chemical harm to bunnies.
If you want a slightly scented room deodorizer that is much more natural, try Cedar Magic or Citrus Magic. It’s kind of a solid stick up that is sold in health food stores and absorbs odor wonderfully with a very mild cedar or orange scent.
Don’t forget the old home remedy standby for making your house smell like a freshly baked apple pie: boil water and toss in apple (great way to use the core after eating one) and sprinkle cinnamon liberally into the water. Boil it, then let it simmer on low for a long time. It will fill the room with a delicious smell of baking. Add water if simmering for hours, or turn off before it empties sooner.
Any natural product is going to be much better for your bunny than one with chemicals. You could probably boil water and add drops of vanilla instead.