Wabi Sabi Wasabi
Worth a visit
An authentic spot, close to the bustle of Shinjuku. It's a small place where you eat at the bar, so I recommend going alone, as a couple or trio, and the menu is completely written in Japanese. If you like ramen and don't speak the language, you can try your luck with one of the order-taking machines. It's worth it, because the ramen is good here.