If you are soba freak, go to Shirogane, hidden holy land. One of best is Muho near Shorogane Takanawa st.
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However l rather go to Muho in Shirogane-Takanawa for Soba restaurant
If you are in the mood of Chinese, go Osho of Gyoza (Dumplin). 1,000 yen will satisfy you including beer on tap.
If you like more secret place, try Rogetsuan or Nioka, next best but ones of top in Japan.
One of best of the best Soba in Tokyo is Komiya 5 min walk from Hamamatsu-cho st. Don’t believe other ranking.