My partner and I have spent over a month in Sabahattin's place (initially we planned two weeks only). It was a very spacious and stylish apartment. I really loved it a lot and I found it was even bigger and prettier than on the photos. The place was big enough to fit 5 guests (with one sleeping on the sofa), but I wouldn't stretch it over 4.
The apartment had everything we needed - washing machine, laptop friendly space, hair dryer, nice oven, huge screen, everything we needed for cleaning, a few mirrors)) Is was nice to have a lot of storage space, I was even afraid to forget some things in one of the many drawers.
Sabahattin was a really great host, very friendly and super helpful. He helped us with a lot of stuff, was always there to answer the questions, give us a hand with the suitcases or help me with advices.
There was a nice cafe downstairs where we could work and have a tea or coffee. Also - lots of cafes around (our recommendations - Galista, Divan lounge, Falafel Koi and Lebanese guys down the hill), couple of grocery stores, nice ateliers, vintage shops, a very good hospital (7 mins walk) and lots of tourist attractions in walking distance.
All in all - very good experience and I would definitely come back, given a chance.