I have had trouble finding ATM money in Florence, Venice, Bologna, Paris, London, Moscow, PetersburgNice, Cannes. Probably a few more. Trouble is at least 2 non working machines in a row.
I must burn a lot more cash than average, because I convert at least $100 a day, and frequently get to $2-300 a day. Driving a car in Italy between tolls and self service gas (feed money to the machine)can be very expensive, as can my wife's shopping habits.
Most machines will not allow withdrawal of more than about $200us, and I do not recall any machine that would allow €300.
Take two cards, so when you find a working machine, you can get some real money.