If you are soba freak, go to Shirogane, hidden holy land. One of best is Muho near Shorogane Takanawa st.
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This is a top of top soba restaurant, Sango-an in Shirogane. Even listed in Micheline, lunch cost you from 800
The best kushiyaki @ Shinagawa st. is Marumiya in Shuwa bldg. 2 min from Takanawa exit by only ¥3,000
2nd. Best Yakitori (Grilled chicken) at Shinagawa station is Tori-Tetsu in Konan area.
However l rather go to Muho in Shirogane-Takanawa for Soba restaurant