The flat is great- very clean, good location in the middle of Taksim and nearby many excellent restaurants, street food, shops, etc. Given its central location, there is definitely noise from the streets below at night- people, garbage trucks, nightclubs, etc. so if you are sensitive to this, might be good to bring earplugs.
Ertan was very responsive and helpful throughout my stay. I had a few issues with the internet connection in the first few days, which Ertan was able to mostly resolve. I appreciate the quick communication and hospitality!