A very nice, charming apartment. The staff was extremely friendly. The location is perfect, just a short walk from Istanbul's main architectural attractions - the Blue Mosque and the Haya Sophia. Very close to public transport - tramlines are a few minutes walk as well. Plenty of restaurants and hookah joints nearby.
Overall, The flat and the area around it feels less "touristic" than other nearby parts of town - the looks, sounds and feel are more for the locals...
It might get loud in the early morning hours because of the combination of prayers and seagulls, but other than a really nice spot