In some apartment ads I've seen it say "kuche MIT GWM" what is GWM? I asked my German roomate and he said it must be Swiss

In the US it'd be Gay White Male -- maybe the kitchen comes with a cook?

Could it be Geschirr-Wasch Maschine?

Usually it is referred to as a Geschirrspülmaschine (dishwasher), but that is my only guess (as well as that of my Swiss hubby)...

Geschirrwaschmaschine = Dishwasher