I love Afghani food and places like N + K are why.
You order off of takeout menus and pay before you sit down. You'll get a buzzer and that's when you know to go up and get your food.
I usually get the boneless chicken breast kebab with rice. I've always found this quick service restaurant to be clean and inviting, with a great ambience (fun decals).
The food has always been flavourful and I absolutely love their naan -they bring it fresh and warm.