Saya pikir sesederhana ini saja.

Is there any cafe with Japanese as its spoken language?

Ref:
When these students are placed in an informal setting with other Navajo friends they still continued to choose English as the spoken language. Many times when the students were spoken to in Navajo by the assistants or the bilingual teacher their response was in English.

Bisa juga mengatakannya seperti ini:

Is there a japanese speaking cafe?

Contoh referensinya:
"...Bit more pricey than your average cafe, but worth it for the view of the market and the surprising Japanese speaking cafe owner. At least we think she may ..." - www.guttereats.co.uk/review_Market_Cafe.html

IMHO

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Note added at 47 mins (2007-08-08 04:17:45 GMT)
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Contoh lainnya ada "Japanese Speaking Restaurant" spt dlm:
"If you compare this restaurant to places like Yo-Sushi then yes, it is an outstanding Japanese speaking restaurant. (tho they did try to speak as much ..." - www.london-eating.co.uk/3078.htm

Inilah phrase yang paling umum dipakai, tanpa secara eksplisit menerjemahkan "bahasa pengantar"