I spent six weeks living in this apartment and can highly recommend it. It matches the photos exactly and was very clean (in fact Cenk also included extra cleanings during my stay).
The kitchen was well-equipped for a longer stay (full set of dishes, pots/pans, utensils, etc.). The kitchen table area is sunny and has a beautiful view, making it a good place to work or relax. The bedroom was very quiet and the bed comfortable. Shower water pressure was excellent. Wifi speed also excellent (around 20-30 Mbps). The building is well-situated, about a 3-minute (uphill) walk to Taksim and the metro, but on a generally quiet and pleasant street.
Communication was perfect — Cenk is very friendly and was a pleasure to chat with. He responded to messages instantly and resolved all issues extremely quickly. Looking forward to staying here again.