It’s entirely possible to have a cat without your house smelling but so many cat owners get lazy with the litter cleaning. We have one cat, use corn based litter (can’t stand the clay smell of the cheaper litters) and scoop it once a day at least. I’ve had guests multiple times confirm with me that I had a cat when they came over because they couldn’t smell anything and are used to that smell you’re describing. One friend demanded to see where the litter box was because they didn’t believe me lol. As long as you keep on the litter it only takes like thirty seconds to scoop it so there’s no hassle doing it once or twice a day. Also using the correct litter makes a big difference too.