The location of the apartment building is great. It's a 30 second walk from the Galata Tower. The apartment terrace is nice and has superb views of the Galata Tower, the Bosphorus and general cityscape.
The apartment we got was Apartment 6 on the 3rd floor. It was small and in a bad state. It was full of flies and mosquitoes as the windows were open when we arrived. The lounge center table was old and the tabletop had holes in it. There were hard wooden planks in the sofa seats so you have to sit down very gingerly so as not to injure yourself. There were vomit stains on the toilet bowl and the bathroom sink drain was blocked. There weren't enough sheets and towels for the 3 of us and there were no mugs for tea/coffee. The grill over the electric stove was broken. The ceiling had weird rust like stains on it and there was a cigarette burn in one of the sofa seat cushions.
Some of these problems (towels, bedsheets, mugs, sink drain blockage removal) were solved the next day when we messaged Omer about it. The toilet vomit stains were partially cleaned but were still visible.
As our flight left late in the evening on the day of our checkout, Omer and his assistant allowed us to check out later. We were moved into apartment 3 on the first floor for a couple of hours before we had to leave. This was FAR nicer, bigger, cleaner and well-maintained compared to the apartment we stayed in.
I wouldn't recommend staying here unless you can be sure about which apartment you will end up getting.