5 Room Dungeon with Story Elements

1. The Entrance that typically has a guardian of some type.
2. The Puzzle or a roleplaying challenge.
3. The Setback or a trick of some sort that impedes the heroes.
4. The Boss Fight room that provides a climax to the delve.
5. The Reward, which could be an antechamber that provides some loot or a potential revelation that ties the story together satisfactorily.

I really like this site for examples for the different types of rooms:  5-Room Dungeon Model Tips

And I really like this one for advice on keeping it short and sweet:  5-Room Dungeon Model on the Fly