Answer:
ferrets themselves have a unique faint leathery smell to them. What smells the most though are the things your ferret uses. Such as thing as they sleep in (which is alot). If not washed regularly, the smell gets a bit much. BUT if you clean their cage once a week, change the litter everyday, and make sure to wash the things your ferret touches regularly, then this smell wont be a problem. I personally love the way my ferret smells. However the other smells can get bad if neglected, haha.