My litterboxes are in my laundry room. The things that help me are to scoop it twice a day, you hardly notice the smell then!
Also, I bought this bag of rocks at petsmart. I don't remember what they really are called, but basically its a bag of rocks that absorb odor. They really do seem to work. When they start to stop absorbing odor, you boil them and then let them dry in the sun to rejuvenate them.