Mcdonald’s restaurants in Greece are covered with free wi-fi. So it’s a quite good dining choice for budget travellers. Typically, there is only one credit card reader for the whole restaurant though.
McDonald’s restaurants are famous for its 1-Euro menu in Europe including in Greece. Although the menu varies by country, Cheese burger is usually on the 1-Euro menu. They even offer free tap water should you need.
Don’t throw away the receipt if you need to use the washroom. Because you need to enter the WC-CODE listed on your receipt to open the door.