I can't express enough how we liked the place and the area. Clean place, 1 bedroom with 1 shared room. A double bed in the bedroom, 2 sofa beds in the shared room - enough to accommodate 4 people (including being for 4 people).
The apartment is very tidy, not very fancy, but who needs a fancy flat when one spends there only a night :)
The restaurant downstairs was absolutely a blast. We were taking small breaks after long days of non-stop shopping for Turkish tea with a piece of baklava before going upstairs to have some sleep. The food is amazing (lamb shish kebab), draught beer (Efes), and their very friendly staff.
Regarding the smell issue, that was mentioned in the comments, whatever the issue there was, it appears to be solved and we didn't experience any smell issues during the stay. Although, after taking a shower, the humidity is quite high, which may contribute to a "wet smell", which is easily resolved by keeping the fan running for longer.
I also need to mention that the apartment is on the 4th floor (3rd floor by British standards), with no lift. Just a heads-up for people traveling with heavy suitcases :)
Other than that, there is simply nothing to add or complain :)
Regarding the taxi/airport transfer discussion, that was mentioned in the comments, stating that Kenan's suggested transfer charges more than a general taxi. Basically, it is a luxury van size taxi, which is, in general, more expensive than other taxis. It's not something that he is trying to make more money from tourists. I'd recommend using an Uber app, with cash being selected as a primary means of payment. You can negotiate the fixed price with the driver beforehand. However, the airport transfer is a very long drive, so the price could vary. A regular orange or blue taxi cost us 380 liras.
Again, kudos to Kenan for such a great service.
Sahet