First up, Nevzat is a very good host. He replies almost instantaneously to any and all queries. You cant ask for much more!
As for the place, it is very neat and modern. It has clearly recently been renovated and is in new good condition, and is very comfortable. It is in a fantastic area, right at the bottom of Istiklal Street, which is the main pedestrian mall, wth plenty of food and drink options, and has a tramline running right through it. Given this, it is a vibrant and often loud area, so keep that in mind. It is also in the music district, where there are often drum and other lessons taking place.
This apartment is the perfect base for food, drink and tourism. I highly recommend staying in Beyoglu and travelling down to Sultanahmet when you want to. For nightlife, and to mingle more with locals are legitimate establishments, Beyoglu is perfect.
Overall, thanks for the great stay and I would encourage others, that are keen to dive head first into Beyoglu and it's surrounds, to consider this listing.