It been shown air fresheners can be harmful to humans (especially if you have any sort of allergy or asthma) so I like to keep things like that away from my snakes.
I have an air purifier in the room and that's all. I notice no smells. No one should have a smell problem unless they need to clean.
if its a room with rats and mice i will use coffee in cups around the room and on the mice tanks i use an old snake bag filled with coffee to get rid of the smells. Snake rooms i just use a plug in air freshener on low till it runs out. Both methods keep the rooms smelly squeaky clean