diff --git a/hcloud/core/domain.py b/hcloud/core/domain.py
index 21aed34..ec54ef3 100644
--- a/hcloud/core/domain.py
+++ b/hcloud/core/domain.py
@@ -2,15 +2,16 @@
 
 
 class BaseDomain:
-    __slots__ = ()
+    __slots__: tuple[str, ...] = ()
 
     @classmethod
     def from_dict(cls, data: dict):  # type: ignore[no-untyped-def]
+        """Convert a dict to domain object."""
         supported_data = {k: v for k, v in data.items() if k in cls.__slots__}
         return cls(**supported_data)
 
     def __repr__(self) -> str:
-        kwargs = [f"{key}={getattr(self, key)!r}" for key in self.__slots__]  # type: ignore[var-annotated]
+        kwargs = [f"{key}={getattr(self, key)!r}" for key in self.__slots__]
         return f"{self.__class__.__qualname__}({', '.join(kwargs)})"
 
 
@@ -24,10 +25,9 @@ class DomainIdentityMixin:
     def id_or_name(self) -> int | str:
         if self.id is not None:
             return self.id
-        elif self.name is not None:
+        if self.name is not None:
             return self.name
-        else:
-            raise ValueError("id or name must be set")
+        raise ValueError("id or name must be set")
 
 
 class Pagination(BaseDomain):