1K rooms are a popular type of accommodation in Japan, offering an affordable and comfortable stay with basic amenities such as a bed, private bathroom, air conditioning or heating system and sometimes even a small kitchenette. They are most popular in Tokyo and Osaka but can be found in other major cities as well. The cost ranges from around 2 000 yen to 10 000 yen per night (approx US$20-100) and payment options vary by hotel. 1K rooms have become increasingly popular over recent years due to their affordability, making them perfect for those travelling on a budget. Booking is easy via websites such as Booking.com or Airbnb.