I stayed for several days , the cleaning is very good at apartment also host offers transfering from airport to place to make easier to get to place. Only thing I really suggest to contact through airbnb because if something should be fixed or you have any questions, problems , its faster way to do it through air bnb than whats up that is also offered.
The location is not so far from centre but not walking distance . And need to understand your main target for comming to Istambul .
For visiting certain region its better to choose that region because with taxi trraffic takes long time to get somewhere.
And for walking , the way is up and down through hills.
Otherways.
Thank you for staying and taking care.