I'm going to chip in because folks mught be interested to hear an Australian perspective - although it's not particularly different. My coop is what americans would call combined because a run is built in, but the run and coop have the one big floor. So, the coop is not separated from the run. It's probably easier to say it's a royal rooster chicken palace, then you can look it up.
Anyway, the whole thing is littered with a 50-50 mix of pine chips and dust-extracted pine shavings, about 30cm (I think that's a foot) deep. In my v dry climate, the litter absorbs all the moisture and most of the stink in the poops. When I can't stand to look at it, I remove the old litter, put fresh in, and hose-scrape off the various roosts and ramps. Every 3-4 months. I'm in a suburban environment and the neighbours have never complained.
My coop is similar but no attached run. I love it!