I just moved to Istanbul and spent my first month there in this beautiful apartment. It's even cozier and prettier in person and is very comfortable and has absolutely everything one may need for a short or long-term stay: extra towels, sheets, dishes, snacks, cleaning products - everything!
The neighborhood is extremely safe - you'll see and hear children playing outside at all times; and it's steps away from Istiklal Street with numerous shops, bars and exciting nightlife. There are little shops right by the house too, where you can buy breakfast food, fruit/vegetables, water, toiletries, etc. And the metro is also 5 min away.
And, of course, the host :-) Jonas is absolutely wonderful, attentive, funny and very handsome! He was very welcoming and always helped me with anything I needed. He also knows the city very well, speaks god knows how many languages, and will recommend you places to eat, hang out, go see and also places to avoid :-)
I can't put in words how much I recommend staying here and making this beautiful apartment your home while you are in Istanbul!