Etem is incredibly knowledgeable. A graduate in economics with a special interest in architecture, Etem has an in- depth knowledge of everything related to Istanbul, from cuisine and architecture, to history, transport and economics. He opened our eyes to features of Istanbul that we would never have found on our own or on a more general tour. Highly recommended! Our only regret is that we did not engage Etem's services for two days, instead of only one.