A restaurant that advertises none acceptance of reservations turns me off. Being the sole pizzeria on 17 Avenue that has gluten free options it's a bit disheartening to wait at the door for hours on end.
I don't mind the no reservation concept. But if you're a restaurant that does not accept reservations, you should not serve food at the bar where people can sit and wait. UNA does the pizzas greatly but the concept of the restaurant is wrong.
PS: Taking my cellphone number down and calling me when a seat frees up is not a solution.