I am only giving Sanno Byoin 3.5 because of the LONG wait times. The nurses and doctors are courteous & professional with the exception of one male doctor.
Be prepared to wait for up to an hour for an appointment. You should also be prepared to wait up to 30-30 minutes to pay on the 1ST floor and to receive medication.
I find some of the receptionists to be a bit silly and unprofessional at times but it isn't excessively, bad behaviour.
It is EXTREMELY expensive as well.