Once contacted Motor Inn nicely explained all the local road and rental rules, offered really nice options and he provided all the instruction.
They delivered our quads to the closest point from cable car station, which was about 200 metres. Quads were great, pretty new and in great condition. Helmets were included in price.
Prices were more than reasonable! Person who delivered the quads told us best places where to go off routine paths and we managed to visit even more places than expected on this beautiful island of Santorini.