This place has a lot to offer!
The pros- this apartment is in the basement and has a lot of windows so it does not get hot in here in summer and you can get fresh air and natural light especially in the bathroom and bedroom. Also there is excellent privacy from neighbours.
The location is excellent. It is quiet and leafy with just a 5 minute walk to Taksim square. There are many stairs in this street which is great for exercise but this building there are not too many to acces so it makes it easier if have heavy luggage . There is a cool swing in the lounge and you have a washing machine to use and an outside area to dry your clothes. Excellent shower with hot water all the time and good pressure. Kitchen is a good size with all the utilities you need.
The cons - You do need to be aware of the major street cat issue in Istanbul . There are many everywhere and during my stay they would come in the open windows a few times but never in the bedroom luckily. In winter with windows closed probably not an issue. Also the place would be better with a bigger working and eating space/table and chairs and more light in the lounge. This could probably be easily solved.
As for the host, Yakup is very attentive and responded to all my requests promptly and kindly. He speaks very good English and he really tries his best to help you enjoy your stay so I'm sure this place will continue to get better and better! great value for money! I would come back again for sure.