As a couple, we stayed at the Kumamoto Hotel Castle for two days and took 12 self-driving trips around the most southern parts of Japan. Our experience with the hotel began with parking the vehicle. We were quickly assisted with our luggage at the front of the hotel and then ushered to the car park. The nature of the services was warm, efficient, and friendly. This trend continued throughout the stay. Our primary interaction was with the front counter staff - checking in, returning the keys and seeking information. On all occasions, they were excellent.
The room was comfortable, clean, and tidy. As it was a two-day stay, we did not require cleaners, and while they were concerned, we were equally insistent.
While the service was excellent at the breakfast, we would prefer not to have a choice between Japanese or Western cuisine. We found both underwhelming.
Overall, I would highly recommend this hotel.