What a perfect place to stay!
We lived in apartment for a full month and the location is just perfect. All the main touristic destinations of Istanbul are 3 minutes away. In a 5 minutes, you can get to the tram stop, which quite handy to avoid traffics and taxis. Laleli, Aksaray, Gulhane park are in walking distance. Apartment itself is on the very quiet street which is good if you are with kids. But if you looking for more exiting evenings, the next street down is full of restaurants and pubs. A sea side is just 10 minutes walk.
The owner of the apartment is right around the corner, responds to the messages in an instant and happy to help you with any sort of questions. We were also offered an airport transfer and an early check-in.
With no questions, I will be back to the same place if we come back to Istanbul.