LE DÉZALEY

This restaurant is clearly aimed at tourists and it operates like a factory, churning through customers. Every guest has to order at least one main course no matter what, and they serve you quickly, trying to get you out as soon as you're finished.
However, staff is kind, so it is not done in a rude way; it's just very clear that this is not the place where you'd go to enjoy a long and relaxing dinner.
In other cities, it would be considered an expensive place (for example: 31 CHF for the basic fondue served only with bread, plus another 7 CHF for the potatoes, or 46 CHF for a cordon bleu), but for Zurich's old town, these are standard prices.
The fondue, which is what they're famous for, is honestly good, especially if this is your first time trying it. Not the best I've had in my life, but definitely well-executed.
Overall, my suggestion would be that if you're looking to try typical Swiss fondue and you're in the old town, this is one of the good options. If you're looking to eat anything else, there are better and cheaper options around.

Even though the place was historical, the waiters were grumpy and the restaurant had a heavy cheese smell.

We had a reservation a week earlier and when we get there the waiter told us every person has to have one main course which we didn't know. Also I believe this rule only applies to tourists because this rule was written only in English and we could see lots of people sharing one meal.

Bir hafta önceden rezervasyon yaptık ve gittiğimizde herkesin ayrı fondue söylemesi gerektiği konusunda uyarıldık, fakat bu uyarı menüde sadece ingilizce yazıyodu. Mekanın atmosferi iyiydi, eminim fondue'nün tadı da güzeldir. Fakat turist dolandırmaya çalışan bir mekan olduğu için burada yemedik.

Kişi başı 1 ana yemek zorunluluğu var. 2 kişi bir fondue söyleyemiyorsunuz yani. Fondue ve cheese bread söyledik. Fena değildi lezzetler ama işletmecinin tavrı iyi değildi. Asık bir suratla karşılandık. Turistik bir mekan bu duruma dikkat edilmeli diye düşünüyorum. Bir daha gitmem. Ancak bizimle ilgilenen garsonlar iyiydi.