Had an absolutely wonderful stay at Gizems place. 10 minutes walk to Osmanbey Metro, and a further 5 minutes to Nisantasi. There are multiple eating/drinking spots within a 5 min walk of the apartment making it super convenient.
The place is where Gizem actually lives (what Airbnb's were supposed to be, not a commercially managed listing), so has a very homely feeling. It is spacious with two bedrooms and bathrooms, a large lounge and a nice terrace.
Best part was all the suggestions of local places that Gizem shared which were all top notch. Communication was easy and consistent over messages. We stayed as a family of 3 and found it super comfortable and would recommend to everyone visiting Istanbul!