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Can I say,

(A) There is a pleasant ambience (place) to eat.

(b) His stall is a pleasant ambience (place) to eat.

(c) The costomers can eat the noodles in a pleasant ambience.
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"ambience" = the character and atmosphere of a place

#3 is fine. The other two are incorrect.
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If I say,

(A) There is a pleasant ambience to eat / to have dinner..

(b) His stall is a pleasant ambience to eat.

His stall has a pleasant ambience to eat.
Vincent TeoIf I say,

(A) There is a pleasant ambience to eat / to have dinner..

(b) His stall is a pleasant ambience to eat.

His stall has a pleasant ambience to eat.
This is the only one that is nearly correct.