First of all, Murat is an excellent host!
Communication over WhatsApp was very friendly and uncomplicated.
We could check in even late at night and leave early in the morning without problems :)
The apartment itself is amazing, new, clean, well designed and comfortable.
There were snacks, some water in the fridge, clean towels and fast wifi access.
The location of the apartment is ideal, close to Taksim Square, also close to the water front, from where you can go to the Bosporus ferries or train station. Also a few stairs up there is an amazing part of the town with a lot of bars and a very long shopping street you'd expect in European city centers.
If you sleep with open windows you might want to bring some ear plugs, there are a lot of cute street cats living in that area, which can be noisy at night.
It was a great experience and I would book that apartment any time again!