Cengizhan and Ceren's apartment is located at an excellent spot, literally about 200m away from Taksim square (be aware of a massive hill to get to it though!). We found the apartment to be exactly as shown in the pictures and Ceren was very quick in fixing the boiler which broke down and had it fixed within 30 minutes. Communication and general advise was great and I found both of them very responsive.
Very small compliant is that the bedroom mattress has a huge stain on the right side that is visible below the bed sheet so it ought to be changed, otherwise no issues.
Overall, highly recommend this stay, with a super convenient location at Taksim Square.