If you like more secret place, try Rogetsuan or Nioka, next best but ones of top in Japan.
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If you are in the mood of Chinese, go Osho of Gyoza (Dumplin). 1,000 yen will satisfy you including beer on tap.
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
If you are soba freak, go to Shirogane, hidden holy land. One of best is Muho near Shorogane Takanawa st.