A cozy and nice apartment. Very convenient to have a place to work: a good chair and a table near the bed to place your laptop there. A good new building overall as well, with the security downstairs.
There is a bus stop and a park nearby, although to get there (and from there) you need to go downhill/uphill to a strong slope which may be tiresome - use taxi instead. Also, you can get to Sisli or Kagithane metro station on the bus with ease. From the nearest malls, I'd recommend Cevahir ATM as the one to go.
One time the whole district experienced a blackout for ~20 minutes, but a security guard turned on the generator 2 minutes after it happened, which was good to lit up the whole building, so that's pretty cool.
Since there were construction works, hot water wasn't there at times during the last month. Also, the neighbors sometimes smoke hookah on their balcony and the smell can be felt in the bedroom.
Other than that, I'd certainly recommend it and Olgu as a great owner!