Handan's apartment is very cozy, well decorated and clean. It's very close to Taksim Square and also very close to some small stores from which you can buy everything you need. Handan was a great host, she helped us with the check-in instructions and even let us leave our luggage in the apartment in our last day, after check-out, in order to not visit Istanbul with our backpacks on. The Istanbul tourist guides we found on the table in the living room were a nice touch and helped us decide what we want to visit during our stay.
I would totally recommend!