This was truly one of my best Airbnb experiences ever, thanks not just to the lovely apartment itself, but also the extremely hospitable host! Ayda was extremely responsive before my arrival, giving excellent instructions and advice on how to get to her place, and rally helpful with any question I had then or during my stay. She even went out of her way to make sure I got a taxi to get to the airport when it was time to leave.
As for the place itself, it is lovely, comfortable, and extremely clean, with all that one could need. I loved the neighbourhood it is located in - the Besiktas area - because there are so many great restaurants, cafes and bars around, all within walking distance. It's also a great location to be if you want to be away from much of the tourist crowd, as everything here felt very local and authentic. The apartment is also just a short walk away from public transportation that got me anywhere I wanted to go. It also felt extremely safe even when I walked back alone later at night.
I would only say that, if you prefer to be very close to all the tourist areas, then this may not be the place for you - it takes about 30-40 mins to get there by bus/tram. However, to me, this was totally worth it to be able to see a different and more local side to Istanbul.
All in all, highly recommended!