Unlike cats, ferret urine does not have a strong smell and if their stools are left to dry, can be picked up and tossed in the trash the next day. The quantity is quite small. Be careful where you sit and walk when the ferret is out - he might be under a pillow, blanket, pile of laundry, etc. Sleep sofas and recliners are places where ferrets can get caught in the mechanics. Block off furnaces, refrigerators, washers, dryers and dishwashers.
Ferrets have no sense of direction in large areas.
DO NOT allow them outdoors unless on a leash and under close supervision. Rubber toys that a ferret chews on and can swallow pieces of are very dangerous - keep these out of their cages. Even certain types of rags and cloth, some ferrets like to chew and eat. This can cause an obstruction in the intestinal track. Use plain clay, sand or unscented litters.