My girlfriend and I spent 9 days at Julie's apartment.
Julie is truly a super host, she was very welcoming, helpful and reachable at any moment. The apartment was clean, identical to the photos. A nice cleaning lady was coming every three days or so to clean the apartment and change the sheets. The bedroom was spacious and it has a balcony with a nice view over the city.
The building is newly renovated with a nice historical character (which means no elevator though).
The location was good - a walking distance to Istiklal Caddesi (approx. 3 mins). At first, we were worried about the neighborhood (Tarlabasi Blv.) because of its reputation of not being the safest spot in Istanbul. However the apartment was located at the outskirts of the neighborhood, very close to the main street, equipped with advanced security measures. The street was relatively quite and had two 24/7 grocery stores which made our lives a lot easier.
The heating system was excellent, the internet connection was bad most of the times, but that was not a big deal for us.
In general, my girlfriend and I had an amazing time at Julie's apartment. Highly recommended!