По поводу валюты... As for the currency...

I answer questions in a personal about currency exchange in the Czech Republic. You can change both Euros and dollars, our currency can only be changed at the border. Then - no more.

Withdrawing cash from the card is no problem, only you lose interest for cashing out. It's different for different banks. We found a better option : 0) On the first day in the market, we paid with a card at the checkout, and then it turned out that the conversion rate was very profitable. Therefore, upon arrival, try to buy something small on the card somewhere and calculate at what rate the amount is withdrawn to you. If it's profitable, then maybe this is the best option.