It's definitely hard to find the restaurant since its tucked away and shared with another restaurant. We walked back and forth multiple times before we finally realized its shared with Green Tea Lounge. It's right beside Shiso Tree if that helps!
I went with my boyfriend for lunch on a Saturday afternoon and they were packed. The miso ramen was really yummy and if you get the regular size they give quite a lot of ramen. We were stuffed when we left! (Should note that we also got a karaage to share as an appetizer). My boyfriend got the fish broth one and he said it was really plain. The chasu was also a bit stiff and hard to bite. It was decent for the price though!