I will try to be as fair as possible.
The place looks like a good deal in the pictures, there are staffs left from previous guests you may use, looks like the owner tend to keep everything to impress you of his generosity.
I was expecting better attitude and willing to help the guests, treat them like humans not money makers.
First, we have a horrible first night at the place, you had the AC off, no body appreciate leaving them in a hot apartment in middle of August. When I contacted the owner he told me that the previous guest kept the AC on all time, and asked me to go in the morning and talk to the building technician to fix it, the iconic thing he told me if I do what the previous guest did, he will charge me the electricity bill through an invoice to AirBNB (lol was he threatening me)! after fixing it, the AC system was not cool as he described it, I think the owner is busy enough not to take care of it and tune it.
Second, we reported an issue with the drainage, but he took no action. that's not right, we had to deal with this mess the whole stay. when we wash our hands or take shower, basically you shower and the water raises above your feet.
Third, The vacuum cleaner is broken. that's make us live in a dirty apartment for days, he refused to replace it, which is wrong, cleaning keep higher living standards and quality of living, not sure how clean his house is, but we prefer living in a clean place.
4th, The owner are missing an important characteristic for any success business, which is customer service, his attitude dealing with the guests and customers. You can find this aggressive attitude and noisy tone in some places in Turkey. when I asked him to get me a vacuum cleaner and fix the drainage, he told me he won't fix it, and suggested to contact AirBNB and leave if I don't like it. Matter of fact I thought about it, but I was too busy with work and meetings to deal with moving now. I rented the place for two weeks, and I accepted suffering during my short stay.
Finally, the apartment location is the worst among the places that I stayed in, it is not close to a market or a metro station. Mall of istanbul (one of the owner selling points) is in a distance that make it tricky and unpleasant for Taxis to take us, they dont like the distance because they won't make money compared to how much they need to stay in the traffic. It is not worth it for them, I cannot tell you how many times I asked the reception for a Taxi, and they told me to walk to the main street, and even though, I had to stay there for an hour to get a taxi. uber or public transportation is not helping as well. so you have to walk for 11 to 18 min to be in a decent place. Rent a car or you will ruins your vacation time.