For one, the commode is located in a room the size of a small closet. There's nothing else in there. No sink, no bathtub, just a crapper.
The water tank is mounted on the wall above your head. Hope it doesn't come crashing down on you while you're taking a dump.
The commode itself is a different design than what we're used to. Instead of crapping in a bowl filled with water (which helps to mask the stench), your turds pretty much fall on a dry ledge where they sit until you are finished and ready to flush. Inside a cramped closet with a warm, fresh turd sitting on a ledge, the smell is something else entirely.
And when you're finished, you flush, and most of it usually goes down the drain hole.
Now in the train station in Kiev, I was treated to squat commodes. I held it until I boarded the train, which featured a normal commode that opened up onto the tracks below. They would lock the restroom when the train approached populated areas and only unlock them when the train was in more rural locations.
Same in rural Turkey and many other countries.