I did travel twice in eastern Europe (Hungary, Romania ending with a Bulgarian resort) and my experience with the ATM there wasn't quite satisfying let's say. Both of them only showed me how much in local currency I want to withdraw, no commission, no extra fees, and no exchange rates. But was quite a long time ago and seems things have changed for the better.
The exchange rate is not shown. But since I withdrew round amounts (200 EUR iirc) it was easy to calculate. The bank fee is shown. And if you are lucky you are asked which bank you prefer for conversion. Also if you are lucky the ATM will work also in English
However, Wirex is most comfortable at using for PoS payments in shops. Use it for that, instead of withdrawing cash. You can get cash from your normal card too.
And if you pay in shops, Wirex shows the transactions quite fast, so if anything unauthorized happens, you'll see it and you can block the card right away. (My normal bank card started having such features only this year).
Anyhow, I'll use the wirex card for cash as the last resort possible, if I lose my card or it gets blocked, if I run out of cash, if I can't pay directly with it, almost no chances of it happening, but it doesn't hurt to know what you might be facing.
This is a risky approach. There's a chance, and not a very small one, that your Wirex card gets rejected.
I used to use Wirex for payments (as long as I had money on it) and my normal bank card as backup.
I want to add a correction/clearup:
The Wirex fee is clearly there, that's for sure.
The Wirex fee is clearly
charged (not displayed on ATM; probably displayed in-app). At this read I've seen that the way I wrote it may imply something else.