A very spacious and comfortable appartment. All furnitures are of a great standard. Very clean and neatly. It is equipped with all the stuf needed for a few people (cuttlery, cups, pots, vacum cleaners, towels, and even flip flops :). Wi-fi works fine, two separate routers, and we had no issue with streaming movies on the TV.
Location is in a regular Istambul residential area, what makes local climate with crowded streets, heavy traffic and many local shops, bars and service points. Relatively close to subway lines. Istambul is enormously large city, hence the tip is to plan your trips with public transportation respectively.
Air conditoning works fine.
The owner is very communicative and helpful, asking frequently if all goes fine. There was no issue with late checkin.