This 3-by-3 premise reminded me of the beginning of a movie or series I recently saw.
Are the rooms movable? Is that why there's no map?
But I liked the idea of rolling dice, creating a unique adventure each time. Plus the final twist of the spirit possessing the merchant. And I imagine the stewmaker is eager to prove himself a master stewer? I ask because there was no word at the end, and I'm making inferences.