Gonokami-Seisakujo/Sendagaya五ノ神製作所/千駄ヶ谷

Gonokami-Seisakujo is technically in Shibuya Ward, Sendagaya, but it is a short walk from the east side of Shinjuku Takashimaya.

Note that this trip was in the middle of the worst snow ("worst" = 4-5 inches) that Tokyo had seen in a long time.

The review/discussion here says it all (Silverjay on Chowhound went there first and discovered it):

http://chowhound.chow.com/topics/930471