This is one of the best experiences I've ever had with airbnb or via a hotel/etc. Not only is the place stylish, clean, but there's lots of space and enough amenities to make your stay comfortable - whether you want to go self-catered or experience the delights of Istanbul's food. Ali's place is probably about a 20 minute walk from the old city, and is in a really dreamy little neighbourhood. Couldn't ask for me!
Ali has also been hugely helpful, informative and has really gone the extra mile to make sure the trip has been great. Can't recommend enough. Would definitely stay here again next time I'm in town!