Long story short you'll end up making an amazing friend. Orcun is very friendly and outgoing. The apartment is very spacious and the bedroom is big enough with a private balcony. Lot's of extras are included in the stay such as 2 big pc screens in the bedroom with Netflix access as well as a big smart TV in the living room with PS4 and a surround home theater system for an epic movie experience or simply to enjoy music.
The neighborhood is very quiet and the place is very close to the metro on the red line.
I had a great experience and enjoyed my stay and made an amazing friend in Orcun. He helped me a lot with all sorts of travel/touristic tips around the city. I also had a great time experiencing the best of Istanbul nightlife with Orcun.
Finally, I strongly recommend him as a host for your next trip to Istanbul.