Hi, are there any banks with ATMs on Serifos? If so are these usually reliable?
As you walk from the ferry quay towards the town you will see an Alpha Bank on your left. We didn't have any problems using the ATM.
Something to be aware of... When you withdraw cash from an ATM you will be offered two alternatives: to select the amount in euros, or to select the amount converted to your home currency e.g. GB pounds. The amount in GBP will be converted at a poor exchange rate so you should ALWAYS SELECT EUROS. You might be asked "are you sure" in an attempt to get you to accept the bank's exchange rate, again decline this and select euros.
More detail here if you want it: