Hotel Sunroute Kumamoto faces onto Ginza Dori, a street that intersects the nearby Shimo Dori arcade.
Please note that the Lobby is located on the 4th Floor -- not at ground level as you might expect.
After entering the building from the Ginza Dori covered sidewalk, shown in the photo, you will see a Nippon Travel Agency sign, and the elevator to the 4th Floor is all the way to your left.