This apartment is in the very appealing neighborhood of Cihangir, which is full of charming narrow streets, excellent cafes and restaurants, art, friendly people, and LOTS of cats.
The view from the apartment is spectacular. You can see a huge expanse of the Bosporus, the old city, and the Asian side of Istanbul. Ferries and other boats are cruising past all the time.
This apartment is best for independent travelers who don't need a lot of hand-holding. I suggest having the host arrange travel to and from the airport, as the place is a little tricky to find.