This is the 24th Airbnb I've stayed in — and the nicest, by far. It's just like in the pictures, super stylish and spotlessly clean, with lots of nice amenities like drinks in the fridge, magazines in the living room, a loofah in the bathroom, and more goodies.
The location is also great, just down the street from Galata Tower and loads of hopping shops and restaurants.
Note that although the apartment is on a side street, there's still some noise from all the busy activity outside, so that's something to consider if you're looking for peace & quiet. Not a fault with the apartment, though — if you want to be in a lively area, you're going to have some noise.
I would not hesitate to stay here again, or to recommend to a friend. Great place!