Sleeping in a kiosk

I just love new and innovative ideas. In May I'm going to Berlin and when looking at different hotels I stumbled upon this one:

Schlafen im Spätkauf (to sleep in a kiosk with late night opening hours)
One couple in Berlin has opened this "hotel" where you can stay overnight for just 20 € in a room located on top of the kiosk. No fuzz - just clean rooms, shared bathroom and kitchen, personal amenities, shuttle service and a late night drink with the owners when they get of their shift.