We stayed in Barbaros accommodation while I attended a conference in Istanbul. The flat is well located and close to the historical part of the city, 15 minutes walk to Sultanahmed. There are the main touristic attractions such as Blue Mosque, Aya Sofia, etc. It is also near the tram station Beyazit/Grand Bazaar. The communication with Barbaros was good and he sent us the address and itinerary, so it was not difficult to get to our accommodation using public transport from Ataturk Airport. When we arrived, Ali was there to show us the apartment. He also gave us some useful information about the city. One additional comment: the floor of the apartment above us is wooden made which means that all noise of people walking above us could be heard. So, if you are sensitive to noise, that might be a problem. Overall, we had a good time in Istanbul.