The apartment is located only minutes away from the busy Istiklal Street, in a safe and calm neigbourhood. We (2 girls) really liked the liveliness and "hipness" of the neighbourhood Beyoğlu (lots of cute cafés and shops), especially in comparison to Sultanahmet (Old City) which can get very quiet at night.
The apartment itself is very clean and has the basic essentials (and more, like iron/ironboard/hairdryer/ etc.) which was extremely helpful.
Güner and his team were super helpful and friendly, the communication was excellent. They also organised a transfer from/to the airport for us and helped us with directions and recommendations.
All in all we had a fantastic time in Istanbul and would definitely recommend it!