Nomnomnom!
My friends and I like Ichiza a lot, and it is one of the places that we have to go to at least once when we are in town. The decor, atmosphere, seating arrangements, and Japanese writing all over the walls really makes this place feel like a traditional izakaya.
If you can read Japanese, or have friends who can, or know your foods, you'll certainly get more out of a visit here than if you didn't. They have a standard menu, which certainly has a few gems (lots of people order the ramen dx, and the grilled squid is pure nomnomnom), but then they also have their not-so-secret menu plastered all over the walls.
I like to get their kimchi and pork okonomiyaki (they have another name for it that I always forget). One will fill me up, and I usually ask people to grab a bite or two. Couple it with a pitcher of Sapporo (or two), and honey toast for dessert, and thats about as good as it gets!