Regarding the litter and smell - being a relatively new cat owner I did a lot of reading and I came to 2 conclusions (note: I only have one cat, and she's 1) Litter needs scooping every day. Otherwise cat will rightfully be upset and do poop in the wrong place just to let you know. Recommended to have N+1 litters for the N cats, but small apartment = difficult to place/clean all of them. 2) According to many cat book…
If he poops then I remove it immediately. Otherwise I collect any urine deposits at night before I go to bed.
Obviously the poop itself smells but I've never had a problem with litter smell and don't understand what people are doing wrong. Surely they just aren't cleaning the litter box enough.