Richmond Hotel Kumamoto Shinshigai located in the center of Kumamoto City and has easy access from Sakuramachi Bus Terminal where you can take buses to Kumamoto Airport and other cities.
Local trams also take you to Kumamoto Station about 15 minutes from Karashima Station where is the nearest station.
The hotel is in the arcade called Sunroad Shinshigai where you can find a lot of stores and restaurants.
Kumamoto Castle is also close from the hotel.