My girlfriend and I stayed here for one week. The apartment is light and spacious, in a great neighbourhood. Gorceries, bakeries, cafes and coffee shops are 1-2 minutes away.
Our arrival was disappointing though. The gas heater was off when we came. As a result the apartment was very cold and there was no hot water. Moreover, the heater was leaking. We contacted the owner over a video call and explained the situation. He sent out a plumber and gave the instructions on how to turn on the heater. It took us about two hours total to solve the problem. After that the apartment heated up pretty quickly and we had no issues with the heating or hot water afterwards. But still, I think the apartment should have been prepared for our visit.
I stayed in a few apartments in Istanbul before for a similar price. This one is not the cleanest or newest of them. But it was comfortable enough and we had a good time there. Again, the neighbourhood is great, everything you'd need is right there.