We stayed 2 nights in this apartment in Summer and it was the perfect size for two people. Very clean and the photos of the apartment are accurate.
The host was excellent. She met us on arrival and let us check in early. She also held our bags as we had a late flight home. She also helped with advice on where to start in this amazing city and how to get a taxi to the airport.
The location is good if you want to be right in the hustle and bustle of Istanbul. You are directly opposite Hagia Sophia, with a fantastic view. We enjoyed listening to the prayer calls from here and the Blue Mosque, but just be mindful these start in the early hours of the morning! Unfortunately, there was some very loud roadworks right next to the apartment which did disturb sleep, but hopefully this will be finished soon; it's just worth bearing in mind if visiting in the next couple of months.
We would recommend this apartment to anyone visiting Istanbul for the first time!