This place is perfectly located for so many reasons:
1. The location: The apartment is very convenient to Taksim Square, major ferry stops, Sultanahmet, etc. It's easy to walk to any of these places -- catching a tram or tax is also a breeze!
2. The neighborhood: Nestled in between Karakoy and Taksim Square, it's easy to walk downstairs and find whatever you are looking for, from traditional cafes to trendy bars, the neighborhood is totally happening and the people-watching is second-to-none. There were so many amazing places to eat and drink, and everything is incredible scenic and pretty.
3. The street: The street is very quiet despite the fact that it's located in a vibrant neighborhood.
4. THE VIEWS: The apartment is on the top floor of a building that overlooks the Blue Mosque, Hagia Sophia, the bay, the bridges, etc. It is the best view we got in the entire city and we couldn't wait to come back every day to sit out on the terrace at sunset.
In addition, our host, Ilahn, was incredibly helpful and accommodating -- thank you!!
The apartment itself is very light and airy with lots of windows. It's outfitted thoughtfully with everything you could need for a good stay in Istanbul. We had a very comfortable stay and appreciated the respite it provided from our days wandering the city.
I would recommend this place to anyone (except people who cannot easily climb stairs -- I don't think there is an elevator in the building)