Overall, this is a good place to stay.
Pros:
Host was very polite and helpful and accommodated a late arrival.
The apartment is in the perfect vicinity for exploring old Istanbul.
The apartment contains all the utensils necessary to make tea, Turkish (not drip) coffee, plates, kettles, etc. (ingredients not included)
Good price for two bedrooms
Air conditioning that works well
Cons:
The bathroom sink stand had mold in it and the smell was very bad. It gave me a headache and if we had been planning to stay in Istanbul longer it would have forced us to find another place. We were able to put up with it for two nights, since we were sightseeing during the day. We mentioned it to the host, so hopefully he will have it replaced soon.
Communication by the app and phone number given was very slow after arrived. However, Fehmi could usually be found nearby outside.
It was difficult for our taxi driver to find the location based on the address, but Fehmi waved us down and showed us the way from where we were trying to find the right way to go.
In conclusion, there are definitely more luxurious places to stay nearby, but you will pay more. If affordability is your priority, this will be a good place for you when the mold is fixed.