diff --git a/src/aioappsrv/app.py b/src/aioappsrv/app.py
index de8592b..9208f24 100644
--- a/src/aioappsrv/app.py
+++ b/src/aioappsrv/app.py
@@ -134,7 +134,7 @@ class AppService:
 				return None
 			res.raise_for_status()
 			doc = await res.json()
-			return User(**doc)
+			return User.parse(doc)
 
 	async def register_mxid(self, mxid: str) -> None:
 		bare_mxid = fmt_mxid(mxid, full=False)
@@ -213,6 +213,24 @@ class AppService:
 			res.raise_for_status()
 			self.logger.debug("joined room %s with %s : %s", room, mxid, await res.json())
 
+	async def room_members(self, room: str, mxid: str | None = None) -> dict[str, User]:
+		out : dict[str, User] = dict()
+		async with self._client.request(
+			method="GET",
+			url=f"{self.client_api}/rooms/{room}/joined_members",
+			headers=self.api_headers,
+			params={"user_id": mxid} if mxid else {}
+		) as res:
+			res.raise_for_status()
+			self.logger.debug("listed room %s users with %s", room, mxid)
+			doc = await res.json()
+			for mxid in doc["joined"]:
+				if not mxid:  # wtf mypy??
+					self.logger.warn("empty mxid: %s", mxid)
+					continue
+				out[mxid] = User.parse(doc["joined"][mxid])
+		return out
+
 	async def send_message(self, room: str, text: str, mxid: str | None = None) -> str:
 		async with self._client.request(
 			method="PUT",
diff --git a/src/aioappsrv/matrix.py b/src/aioappsrv/matrix.py
index efbf14b..673057a 100644
--- a/src/aioappsrv/matrix.py
+++ b/src/aioappsrv/matrix.py
@@ -7,6 +7,13 @@ class User:
 	avatar_url: str = ""
 	displayname: str = ""
 
+	@classmethod
+	def parse(cls, obj: dict[str, Any]) -> 'User':
+		return cls(
+			avatar_url = obj.get("avatar_url") or "",
+			displayname = obj.get("displayname") or obj.get("display_name") or "",
+		)
+
 class EventType(StrEnum):
 	MESSAGE   = "m.room.message"
 	MEMBER    = "m.room.member"