The McDonald's. The interior is clean, it's easy to order a combo just by calling its number. There are no self-service vending machines, so take either a combo, or use gestures / in English / in Turkish to try to order something other than a combo.
The service is worthless in comparison. The cashier stands and takes orders and puts food on. It takes an extremely long time. You can place an order for food only on the second floor. The various sauces that we are so used to are missing! They have mayonnaise with ketchup guys.