I stayed in three different Airbnbs while in Istanbul, so I have something of a local perspective on this. I would say it is fine but ranked last - primarily because of value and location. But it depends a lot on what you want.
This place is clean and well-equipped. They have a working laundry machine & even provide washing powder. They also stock things like soap, TP, etc. If you want to cook there, you can - unlike some places that really don’t have the amenities.
The primary drawback is the location. The neighborhood is not charming, it is hard to find decent restaurants, and the walk to the Bazaar is uphill through uninspired shops (mostly shoes). Having stayed in both the Beyoğlu and Fener/Balat neighborhoods, I found both infinitely more charming. That said, If your goal is to be in Sultahnamet and you’re on a budget, this place is fine.