In Turkey, both EUR and dollars are accepted and even in many cases rubles, but in different regions different situation. If you are in regions where beach tourism is actively developed, then it is simpler, but in Istanbul or another city it is more complicated.

There is one little trick: if they have prices in EUR, then when converting to dollars or rubles, they will take into account the difference in rates, and so in any case, no matter what currency is in the price tag. But the trick is that you have dollars and euros ... and bargain, bargain, bargain !!! )))