Our stay in Saban's apartment was great. We actually ended up staying in the penthouse flat, on the floor above the one we had booked, but this gave us more room and a view of the Bosferous. (So this review is for the penthouse flat and not the turga suite, pictured, with balcony.)
Apartment is simple, quite small, but just right. Warm , comfortable, good shower, Turkish TV & wifi. Great sunsets! Only a 10 min walk from Grand Bazaar and main sites at Hippodrome, but set in the more local, less touristy 'leather shop' area. As a result you can get a better feel for Istanbul and eat a bit cheaper- great Borek pastry shops. Also very near the street of Fish restaurants at Kumkapi. Best meal of the trip was a simple Mackerel Sandich, grilled infront of us, by the Bosferous, just over the main ringroad from Kumkapi.
Although we never met saban, he has been very helpful in answering all my questions and also booked our transfer back to the airport. Highly recommended!