Daniel's apartment is on a quiet side street in Karaköy, close enough to all the shopping, restaurants and cafes in the area, without feeling like you are in the middle of a busy tourist area. The tram to the main sights of Istanbul stops is a short downhill walk from the apartment, and Galata Tower and Istiklal street are also both close by - but with some uphill walking involved.
The apartment is beautifully furnished and was immaculately clean, and bigger than what I was expecting, with a bedroom, lounge and separate kitchen. You have a spectacular view over the Bosphorus (make sure you wake up early to catch the sunrise) from the large balcony leading from the bedroom and a view to the Galata tower from the smaller balcony leading off the lounge. It was really handy to have a washing machine in the apartment.
The apartment is on the 6th floor, so if you have heavy bags it may be quite tiring to get up all the stairs, but the views are worth it.
Daniel was great in helping me with directions to the apartment from the airport and was very responsive to any of my queries. I wouldn't hesitate in staying here again when I'm next in Istanbul.