When we first got our cats, we had this problem. But, it's actually really simple!!
If you live in a two story house, put it in the basement! We leave our cat little in the corner, easy to get to, and since we never go down there, it's perfect!
If you live in an apartment, or a house where you use the basement, find a small room that you can do without. Put air freshener in there, if you have to. It will work, trust me.
You should also buy clumping, non-scented kitty litter. It's good for one or multiple cats.
Hope I helped!! Good luck making your house not stink!