Hello Serdad,
We had a great stay in Istanbul and the location of the apartment was ideal.
There is a good wifi in site and quiet place. The apartment is near to Kabatash Tramway 200 m, Taksim Maydan Metro 100 m, Bus station 100m, Galata port 100m. A good alternative for travellers in case you need other than restaurant in a same drive 5m you can by anything's you need fruits, milk, ...etc. Serdar was also a very good host for help if any problem.