Amazing location: the street is very quiet, but at the same it's very close (literally 5-10 minutes of walking) to the most important touristic attractions in Istanbul. Lots of delicious restaurants around, several groceries stores, a laundry. Long story short: perfect location, indeed.
Balcony: that was the second reason why I chose this place. It's very large, and one can see the Blue Mosque outside. Me and wife were drinking tea every evening on this balcony. In the middle of the day it's good for sunbathing. So, balcony didn't disappoint.
Host: very responsive and helpful, always available for texting and calls. Saban speaks English very well, so there was no miscommunication. He helped us with the transportation to and from Ataturk Airport (although it was somewhat expensive).
All in all: strongly recommend Saban's place for rental.
The only thing I didn't like: the walls are thin. I mean, really thin. Soundproofness was insufficient. On other hand, our neighbors didn't make much noise, so I can't say we were disturbed.