Flamingo Cafe
https://www.google.co.jp/amp/s/s.tabelog.com/tokyo/A1306/A130602/13030786/top_amp/
This cafe is not something special, or unique.but there are always repeat customers.
You have salads buffe and free drink for tea or coffee, as well as there are several choices for main dish. It has stability and that let many people come here again.