Considering most people that visit an AirBnb in Istanbul speak English, I'm going to write my evaluation in English.
Simay's AirBnb offers everything that it promises! The location is one of the most central locations in Istanbul. Taksim, Beyoglu, Karaköy, basically all the touristic and central places are within walking distance. More than that it's a location where you don't have to worry about being alone very late at night, because it is very close an area with lots of cute cafes and bars so that there are other nice people around at night and because of the general, modern population of that city part.
I would like to appraise Simay for the great communication. She received us personally during check-in and when we wanted to ask short questions, she was either directly reachable or she replied as soon as she could helping us.
The appartment is tastefully designed, big and has everything one needs, such as any kind of cooking utensils, towels, etc. Everything is absolutely clean. Two beds in two bedrooms are of very high quality. The beds are a little softer for my taste, nevertheless I had slept great in them. There are enough rooms and spaces for living, sleeping and studying / working if needed. There is even a room meant for taking care of a baby if needed. I shouldn't forget mentioning the huuuge flat screen TV in the huge living room!
In front of the apartment there is a beautiful city park. If you go to the end of the street where the apartment is located you can even see the incredable view over Bosphorus! This is because the location is quite high over the see. The appartment itself is on the higher ground floor so that you can see the street and the park from the front side. At the back side, where the bedrooms are located, there's not much to see. If you already use those rooms only for sleeping like we did, that isn't something you really notice. There is a closed parking garage in the parallel street which is extremely convenient if you're on holiday with a car.
For discovering Istanbul in a most comfortable way, I would absolutely recommend this AirBnb.