Overall very good. Nicely furnished apartment, with good kitchen.
Location is close to Taksim square and istiklal street but be aware it is up a steep hill.
Downsides - Bed and Sofa were not the comfiest, felt it in my back after a few nights sleep.
Could also do with more things like toilet roll, washing liquid, bin bags etc. we had to buy our own after a couple of days.