Basic Trope: A setting that looks like a nice place but really isn't.
Straight: Sugarville is a beautiful, tidy town with kind and smiling citizens and no virtually no poverty or crime. Eventually it turns out that the town is secretly run by a murderous cult.
Exaggerated: Sugarville has a perpetually nice weather, everyday is a holiday and all everyone is singing and dancing all the time. Eventually it turns out the townspeople are prisoners in their own bodies that are controlled like puppets by an Eldritch Abomination.
Sugarville looks like an decent town, but citizens have an extreme political ideology.
Alternately: Sugarville is a beautiful, tidy town with kind and smiling citizens and virtually no poverty or crime. However, actual violent crime does happen even if it's much less frequent (it's not just Mr. Meanie stealing a little food for selfish reasons like in a Sugar Bowl, it's actual murder, robbery, arson, rape, and those kinds of things). It just seems more jarring because of how bright and happy everything is. Hence, in this case, the setting is more of The Pollyanna than a Stepford Smiler.
The cult doesn't want to attract the attention of federal police. It does, however, want to attract the attention of unsuspecting lost travelers.
OR Alternately: Sugarville has been hit with hard times and rather than sit and cry about it, they make the best of it.
Inverted: Darksdale is a dirt-poor hamlet in an inhospitable wasteland, and all villagers are ugly, grim-faced and snarky. Nevertheless, most of them are content with their lives and have a warm community.
Subverted: The people that talk about the dark secrets admit that there were rumors.
Double Subverted: Except that was the result of the Big Bad's mind control.
Parodied: Bob the unsuspecting traveler tours cheerfully around the town, oblivious to the black robes on cloth-lines, the hanging rope that doubles as a children's swing and surprisingly large knives in his hostess' kitchen.
The nice and peaceful city turns out to have traps placed in all the homes! But they only activate if somebody other than those on an approved list, keeping intruders out. But they seem to get oddly violent when you talk about the outside world. Actually, one of their best citizens who helped to get the city running as well as it is write a guide to talking with people outside of the community named "the outside world".
Sugarville is a dirt-poor hamlet in an inhospitable wasteland, and all villagers are ugly, grim-faced and snarky. However, most of them seem content with their lives and have a warm community. Then it is revealed they are prisoners in their own bodies controlled and mind-raped by an Eldritch Abomination who farm and eat their souls.
Averted: Sugarville is as good or bad of a place as it appears.
Enforced: "So we need a Crapsack World, but let's up its creepiness and add some surprise."