diff --git a/matrix_appservice_kakaotalk/portal.py b/matrix_appservice_kakaotalk/portal.py
index f6e0c9b..d66553b 100644
--- a/matrix_appservice_kakaotalk/portal.py
+++ b/matrix_appservice_kakaotalk/portal.py
@@ -42,8 +42,6 @@ from mautrix.types import (
     EventType,
     FileInfo,
     ImageInfo,
-    JoinRule,
-    JoinRulesStateEventContent,
     LocationMessageEventContent,
     MediaInfo,
     MediaMessageEventContent,
@@ -55,6 +53,7 @@ from mautrix.types import (
     RoomNameStateEventContent,
     RoomTopicStateEventContent,
     RelationType,
+    RoomCreatePreset,
     RoomID,
     StateEvent,
     StateEventContent,
@@ -826,6 +825,7 @@ class Portal(DBPortal, BasePortal):
             # NOTE Must do this to find the other member of the DM, since the channel ID != the member's ID!
             await self._update_participants(source, info.participantInfo)
         name: str | None = None
+        description: str | None = None
         initial_state = [
             {
                 "type": str(StateBridge),
@@ -841,26 +841,15 @@ class Portal(DBPortal, BasePortal):
         ]
 
         if self.is_open:
-            initial_state.extend((
-                {
-                    "type": str(EventType.ROOM_JOIN_RULES),
-                    "content": JoinRulesStateEventContent(join_rule=JoinRule.PUBLIC).serialize(),
-                },
-                {
-                    "type": "m.room.guest_access",
-                    "content": {"guest_access": "forbidden"},
-                },
-            ))
+            preset = RoomCreatePreset.PUBLIC
             # TODO Find whether perms apply to any non-direct channel, or just open ones
             user_power_levels = await self._get_mapped_participant_power_levels(info.participantInfo.participants)
             # NOTE Giving the bot a +1 power level if necessary so it can demote non-puppet admins
             user_power_levels[self.main_intent.mxid] = max(100, 1 + FROM_PERM_MAP[OpenChannelUserPerm.OWNER])
-            initial_state.append(
-                {
-                    "type": str(EventType.ROOM_POWER_LEVELS),
-                    "content": PowerLevelStateEventContent(users=user_power_levels).serialize()
-                }
-            )
+            power_level_override = PowerLevelStateEventContent(users=user_power_levels)
+        else:
+            preset = RoomCreatePreset.PRIVATE
+            power_level_override = None
 
         invites = []
         if self.config["bridge.encryption.default"] and self.matrix.e2ee:
@@ -878,6 +867,7 @@ class Portal(DBPortal, BasePortal):
 
         if self.encrypted or not self.is_direct:
             name = self.name
+            description = self.description
             initial_state.append(
                 {
                     "type": str(EventType.ROOM_AVATAR),
@@ -892,11 +882,14 @@ class Portal(DBPortal, BasePortal):
             if not self.config["bridge.federate_rooms"]:
                 creation_content["m.federate"] = False
             self.mxid = await self.main_intent.create_room(
+                preset=preset,
                 name=name,
+                topic=description,
                 is_direct=self.is_direct,
                 initial_state=initial_state,
                 invitees=invites,
                 creation_content=creation_content,
+                power_level_override=power_level_override,
             )
             if not self.mxid:
                 raise Exception("Failed to create room: no mxid returned")