On a busy night such as Friday or Saturday, a reservation would a good idea but is not required.
I would recommend getting a reservation, bur id it is a last minute decision, you can give it a shot; probably have a better chance if it is off peak hours
Better to be safe than sorry if you have your heart set on eating there.
I went on a Wednesday and there were only a handful of people. I would go ahead and make the reservation just to be on the safe side.
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