My partner and I really enjoyed our stay at this Airbnb. The hosts Ozan and Ozgur were very kind and forthcoming, and gave us recommendations on where we could explore and eat in Istanbul. The room was clean and tidy when we arrived, properly equipped, and quite comfortable. We often had cats for company on the balcony, which was wonderful.
There was only one issue - it was very easy to hear what was happening in the neighbouring room, to the point where someone talking normally, showering or putting on the kettle in the other room felt like they were in ours.
Also, the staircase leading up to our room felt a bit rickety and oddly designed, which I think would be difficult for the elderly, someone with a lot of luggage, or someone with an injury to climb - especially if they're going up and down several times a day.
If you're okay with those, you'll have a great time here! I imagine the balcony would be really wonderful when it's not rainy or cold in Istanbul.