The hotel is right next to a large shopping street, so it's extremely convenient. I was also to walk to Kumamoto castle without problems.
Check in was quick and the staff were nice. The room was large and quiet, and I really liked the modern interior decorating.
There is an onsen on the upper floor, it was clean. However I went late at night so it so it was also a bit crowded.
I arrived in the evening and had a rental car, so I had some trouble finding parking. I would recommend looking at an online map for parking areas around the area beforehand. Overall I really enjoyed my stay.