First of all I found Çiçek as a very supportive host.
The place has a good access to Taksim Square (5 mins walk) and from there you can use metro and the cable train, using other routes is not recommended since they are hilly. Also there's a good access to many grocery stores and restaurants, as well as Istiklal avenue where you can find a lot of things to see and buy.
The apartment was very cozy, fans were good, kitchen was nicely equipped as well as the living room.
The check-in and check-out process were calm and continent as well.
All in all it was a good experience of staying in Istanbul, and I'm happy about spending my vacation there.