We had the top level apartment and had the view of Galata tower which is nice.
The location of this apartment is in a dark alley but nonetheless the area is safe. We had no issue walking back to the place near mid night. However you might find it hard to find.
The apartment itself is very cozy and comfortable to stay. It is also close to some great local cafes and restaurants.
One bad thing, there is no lift, only stairs.