10/10 - Excellent! (Of course, my personal opinion)
1) Location - good enough. Just in the heart of new city area in European district. You can reach anywhere easily by walk.
2) Exceptionally quiet - Strange to say, it's very quiet at night and even during the daytime. I personally highly value this point.
3) Convenient - For daily living (especially for the long-term stay), it's very convenient to stay at this flat. You can get almost every items for daily living (a top grade bakery, fruits shops, big grocer's, butchers, and many restaurants ...).
4) Perfect for one person, and also good for two (good value for money). I personally liked the living room during my one month stay. The bedroom is actually bigger than the photo ( a queen-sized bed).
5) The 'host risk' is at minimum level, I believe! - A very important and even critical factor!
It will not be easy to find this kind of flat in Istanbul, I'm sure!