Zouroku/Takanawa
蔵六/高輪
Zouroku is located in the Shinatatsu mini-"ramen theme park" near the west (Takanawa) exit of Shinagawa Station. If you are staying in one of the hotels near Shinagawa station I definitely recommend that you check out Shinatatsu, however it can get crowded starting around 4-5 PM. I thought the Zouroku ramen was a bit on the salty side personally.
Pictures+Address
Ramen Road Review
Google Map