Barbaros is a very nice and responsible host. He responded really fast and was always helpful regarding the issues that we might encounter. The manager Juneyt was also very helpful. He even welcomed me during my arrival and gave me a lot of useful information about where to visit and arranged a private shuttle to the airport.
As for the apartment, it is very clean and new, perfectly fit for one person or two for a short trip in Istanbul. The location is nice, centrally located to most of the tourist attractions, such as Grand Bazaar, Hagia Sofia, Blue Mosque, a Turkish Hamam, and numerous museums. All those places are within walking distance, with less than 20 minutes. Many shops and restaurants are also nearby, including a nice restaurant downstairs which is also owned by Barbaros. Highly recommend this place when visiting Istanbul!