Group 1 - Japanese business hotels often have small rooms but still include bathtubs, which can be surprising given the limited space [1] - Japanese colleagues find it inconvenient that many hotels in China lack bathtubs, as bathing is a daily routine for them [2] - The cleanliness of public restrooms in Japan varies, with department store restrooms generally being the cleanest due to dedicated cleaning staff [6][9] Group 2 - There has been a trend in Japan to prohibit eating in restrooms, which may seem surprising to some [7] - Many public restrooms in Japan are equipped with heated toilet seats and cleaning features, reflecting a high standard of hygiene [17][22] - Research indicates that the risk of transmitting skin diseases through toilet seats is very low, especially in well-maintained facilities [27][30]