Assembly Hall is spacious with a cool ambiance which boosts my review of Ramen Isshin to 5*. I got the Kotteri Rich Shoyu Ramen. The broth is thick and a bit oily and has a bold flavor, it's pretty fantastic. Mixing in the dried seaweed from time to time made a boost in flavor. The egg was cooked perfectly - gooey yolk but not runny and the portion was perfect for me.
Try the Ramune drink if you've never had it before. It's soda but has a crispness to it that makes it more refreshing.