I was very happy with this Aparment. The neighborhood was recommended to my by a local and it was perfect. It seems there are many English speaking people living around here and I enjoyed the cafes on this and the adjacent streets. It's a short walk to the Taksim metro and main shopping street.
As others have said, it's much more spacious than it appears in the photos. The apartment is furnished with antique furniture, but the bed was very comfortable. There is an AC unit in both the living room and the main bedroom. The apartment is one level above the street so I did not mind the few steps to enter or leave.
I had to make a couple of work calls while staying here and with the windows closed the apartment was very quiet. I could hear a small amount of street noise in the front room but I never hear prayer announcement music from inside. Internet was average at about 3.2Mbps dn x 0.8 up which was slower than I would have liked but fast enough for my video call. Mobile internet from Turkcell was very fast in the apartment.
The bathroom was spacious with a shower and washer. There was a drying rack and iron in the bedrooms. I was alone, but this apartment had a second bedroom.
If this place is in your budget and available, I would definitely book it now. I will certainly stay here again when I come back to Istanbul.