If you are soba freak, go to Shirogane, hidden holy land. One of best is Muho near Shorogane Takanawa st.
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If you like more secret place, try Rogetsuan or Nioka, next best but ones of top in Japan.
Good authentic Belgian restaurant in Shinagawa St.
2nd. Best Yakitori (Grilled chicken) at Shinagawa station is Tori-Tetsu in Konan area.
The best kushiyaki @ Shinagawa st. is Marumiya in Shuwa bldg. 2 min from Takanawa exit by only ¥3,000