I'll write a rough explanation of the rooms as far as I know. Please use it as a reference if you like.

Beginner Room, Intermediate Beginner Room, Advanced Room, Anyone Room. Rooms in this category are for matches that require discussion. If you are a beginner who purely wants to enjoy Werewolf, we recommend entering the Beginner Room with a 9-player setup including citizens. Theme Rooms These rooms generally do not require discussion. There are rooms mainly for chatting, rooms for roleplaying characters and conversing, etc., and each room has its own unique rules. Usually, the playstyle is written at the top of the log in every room, so please refer to that if you wish to enter. While paid icons and stamps are not mandatory, many players in theme rooms naturally have them, so please be aware if this concerns you. Civility varies greatly from room to room, so it's best not to get discouraged if you happen to encounter a toxic room. It's a player-versus-player game, so you'll meet all sorts of people.