Irem's by far the best host I've came across on airbnb who offered us 1st class hospitality. The apartment was exactly like pictures shown and the bed was so so comfortable! Location is ideal, just 5-7 mins walk to both Istikal Street and Sishane Subway. There were also eateries just 3mins away which operate past midnight. Convenient stores are around the corner so don't worry about getting your drinks/snacks supply.
I'd definitely book this apartment again if I were to return to Istanbul.
Do note that as the apartment is on ground level and basement, ventilation is not the best. If you've claustrophobic, I do not recommend you to book :)