If you like more secret place, try Rogetsuan or Nioka, next best but ones of top in Japan.
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The best kushiyaki @ Shinagawa st. is Marumiya in Shuwa bldg. 2 min from Takanawa exit by only ¥3,000
Good authentic Belgian restaurant in Shinagawa St.
You don’t need to pay 10,000 yen for real Japanese Kaiseki. Hannya-Kuta in Higashi Ginza serve you at half.
If you are in the mood of Chinese, go Osho of Gyoza (Dumplin). 1,000 yen will satisfy you including beer on tap.