As others have said, the apartment has fabulous views and from the rooftop you'll get an amazing 360 degree view of Istanbul so make sure you go up for the golden light of sunrise and sunset. You'll soon get used to the steps up to the apartment, and the climb is worth the views.
I found the sounds from the mosque charming and didn't mind how early they were. There is, however, surprisingly a lot of noise from bars/clubs in the area (it echoes around thd valley) which isn't a problem with the bedroom windows closed but would be with them open on a hot night as there's no aircon in the bedroom.
The apartment is well-equipped and includes a dishwasher and washing machine, and the sofa bed makes a great divan for lounging around on during the day.
Communication for check-in/check-out was easy and straight-forward.
Style wise the apartment could do with a bit of simple updating and some minor repairs to spruce it up, and more attention to cleaning.
It's well located for the tram and not far from Taksim, with cafes, restaurants and supermarkets only 6/7 mins away. You'll get fit as the area is very hilly but you'll get use to that.
I certainly enjoyed my stay and would stay again for the 360 degree panorama views.