We had a great stay at Yakup s apartment..It is based in the basement (-1 floor) of a new building very cloose to Taksim square. Yusuf (Yakup's assistant)was a great host. He was very ponctual and he was very reactive whenever we asked him for help. We had a small water leak in the kitchen for instance and Yusuf arrived 10min after I texted him. He fixed the issue in few minutes. I strongly recommend this place. Good quality for the price we had.
Only comment about the apartment is that there is a hot water tank in one of the rooms and it makes some noises in the evening...apart of that everything else was excellent.