My partner and I are trying to book a hotel in Japan. The room categories for the hotel we want are:
SB= Single with bath
SU= Single use of a twin/double with bath
TB= Twin with bath
SU going to be OK for two people sharing a double?
A Single Use or SU room is for 1 person who wishes to stay in a room with a double bed instead of a single bed (i.e. it's a single occupancy room). You should either get a TB i.e. Double use of a twin room with bath or get two separate rooms.