It's rather on the meh side as far as the cafes in paris go…read more
The internal decoration is definitely amazing and will catch your eyes as you are passing by. Unfortunately, decoration alone does not make a restaurant and Le Zeyer is a perfect illustration of that.
First of all, the food. While I only tested the breakfast, the classical Paris croissant was both on the sadder and the more expensive side and was more of a disappointment, especially given the wealth of bakeries in the neighborhood. The breakfast baguette came with butter alone and was on the chewier side.
Second, the price. It is pretty outrageous, even by Paris standards. Separate price for coffee in the morning or after sets the tune of "we are trying to milk your wallet here", which the rest of the menu keeps up with. A croissant for 3 euros. A coffee with cream for 6. A jam that you have to pay separately for for the tartine. They want your money and they are not providing its worth to you.
Finally, the service. It's just lackluster. The server does not pay attention to you, slow to get the order, will not notice you would like to pay no matter how much you wave your hand - bref, even by Parisian experience it is a disaster.
I would not be returning there and highly recommend that you don't either.