All in all we had a nice stay. The apartment is located at a steep narrow street, but we didn't have any issues walking. It is close to Istiklal Street and the sea + there are a couple of little grocery stores nearby. We arrived in the evening and Ozan was there to welcome us. Checking in and checking out worked flawlessly. The communication in general was great. We were always able to reach the host.
The apartment is ideal for a short stay. If you plan on staying longer, working from home etc. you should communicate with Ozan beforehand regarding basic kitchen utensils and other stuff. We didn't cook, so the lack of cutlery etc. was no problem for us. The place was clean, but could use a renovating touch. The only issue we had was the smell of cats on the street which seemed to carry over to the apartment sometimes.
We can recommend the place. It's a basic apartment, which is well located - not a 5 star hotel. Your expectations should be accordingly.