Probably forbidden by halls
Suspect you'll need to cut off the german plug and screw on a british to get that working - are you OK doing that?
also we don't tend to have mains sockets near showers for safety reasons.
Still got to dry 'em - are you going to have wet clothes hanging all over your room?
laundrette washing machines and dryers can take huge loads, say 15kg, the usual student solution iirc is get lots of cheap clothes and take large batches to the laundry in order to get your money's worth.