When you talk about burgers in Baku, there used to be only one place, Sunset Burgers. However over the past few months, a larger selection have become available. We have tried a few around town (Casual Brasserie, Rock bar in Kempinski) but the burgers at Madison have toped them all.
Vapiano is a chain of restaurants and has opened (relatively) recently in Baku. We've been a couple of times now and the food has been good on both occasions. Service, however, was unpredictable.