Been visiting Seiryumon, a Taiwanese Hakka restaurant for a long time now. Turn right from the East exit of JR Ikebukuro station, walk past Seibu Department store & it is across the road from Starbucks. It is spacious & the service has always been efficient. The food has exceeded my expectations & that is why I keep on visiting this place whenever I am around the vicinity. The dishes are explained in English & I believe they have staff who speak in Chinese & English. And I guess it has now become a non-smoking restaurant.
Here is a link for more details ~ https://gurunavi.com/en/e892400/rst/