We had a good stay here! Burcin took very well care of everything, she welcomed us at the apartment and gave us a lot of information about the city and the surrounding area. Communication during the trip was also very good.
The house itself is good value for money, the house is very big and it has a very nice view from the balcony! I don't think you'll find that kind of view for that price anywhere else in Istanbul.
The interior is a bit old-fashioned, but that might have to do with personal taste.
The only thing that was less good is that there isn't an A/C in the living room, which we should have seen from the pictures. In summer it gets very warm and that makes it hard to stay in the living room during the day.
We both work from home, so that was a problem for us. If you're spending a lot of time outside or on touristy stuff, I don't think this would be a problem for you.
Overall, good value for money. I definitely recommend it!