The flat is in a very safe-feeling area, very close to the main old city of Istanbul. There are some hills but the city is built on hills so that is really to be expected. The easiest way up to the city is not steep and about 5 to 10 minutes walk.
Farouq is a fantastic host, very fast to respond and very helpful. Strongly recommend asking him to arrange airport transfer because the firm he uses is superb and the price was really good value. I have been many times to Istanbul on business and that is the best transfer experience I've had, both ways.
The flat is not high luxury but for a historic Istanbul stay where you just want two bedrooms both with ensuite bathrooms, this is really good value.
Thoroughly enjoyed it and would return.