The flat is exactly as described and illustrated in the Airbnb app. Although I never met Aysu, communication was good. The gentlemen in reception were incredibly helpful, giving us travel tips and advice. It was also nice to have a place to leave out bags once we had checked out. (We only left Istanbul at 4pm)
The flat is down a side road that looks relatively unsafe, however we did not have any bad experiences walking home at night. The apartment is close to some great restaurants and public transport links.
Breakfast was also an amazing bonus! Great food to start the day. Overall, I would recommend this accommodation.