It is not 0-indexed, it is just that "floor" means something different than in American English. It means a level above the ground. So the first level above gro

It is not 0-indexed, it is just that "floor" means something different than in American English. It means a level above the ground. So the first level above ground is the first floor. The German word Stockwerk is even clearer. It describes the wooden planks which separates two levels. So if you live on the first Stockwerk you live one level above ground.