We have those here only a few remaining at the wharfs around 100 or so years old and we do advertise them as apartments.
Strangly enough the house, previously, we call that upper section a "loft", as it is accessed usually via stairs from the house. "With a loft currently used as an office/bedroom"
Yay there you go the Aussie worked out what it was used for
Seems our versions across the World are different.. Predominately our apartments are complexes...
Any other two storey built generally has the garage to the side, Townhouse or is on it's own allotment, therefore a two storey home.