The T&Cs don't clarify the forex margin charged on non € transactions.
Missed that. Not good either as you say.
These sort of features/charges should be the ones that people concentrate on in my opinion. They should really avoid paying the headline interest on balances by clearing their CC each month before interest kicks in. CCs should be used as a cashflow management tool and not for borrowing on (other than during the normal credit/billing period or when there is a 0% balance transfer period or whatever).
But for those not able to clear their balances each month