This apartment is located almost perfectly, being close walking distance to many touristy areas and less than a 10-15 minute walk to the closest tram/train/metro means you have easy access to most public transport services. We had no problem whatsoever maneuvering to and from this apartment.
The apartment itself is well furnished and spacious and has a well equipped kitchen. It has amazing internet (fiber), good AC and heater system, good hot water, and aside from the small bathroom, no fault can be found with this apartment.
We didn't meet our host Ismail aside from the initial reception, but his co-host MIsra was there and she was extremely helpful and delightful. She even arranged for Taxi to drop us off at the airport. We had a problem with the heater at the middle of the night and she came over and fixed it right away without any hesitation.
Overall I would recommend this apartment if you wanna come and visit Istanbul, you won't go wrong if you choose this place.