I had such a great time staying in Mersin's flat whilst my friend and I were completing a semester abroad in Istanbul. The flat is beautiful, very light and decorated very well and has everything you need for a short or long stay. Mersin was always very quick to reply to my messages if we ever had any problems (of which there were very few!) and his mother and assistant were also available to help if ever I needed it. The flat is very close to istiklal and very central but it is still quiet and is in friendly neighbourhood. There is a market every Sunday on the street selling everything from fruit and vegetables to clothes which was wonderful. I loved staying in Mersin's apartment and would wholeheartedly recommend it, I hope you have as much fun in Istanbul as I did!