The apartment was perfect for a stay in Istanbul. The place was very clean and tidy and had all of the amenities you might need (plenty of towels/soap etc.). I was working remotely for some of my time there and the wifi speed was good. The rooftop terrace is beautiful and perfect for enjoying some peaceful views. The location of the apartment is perfect - right beside Galata tower and in walking distance of lots of beautiful cafes/restaurants and the tourist sights. It is also close to transport links - Sishane metro station and the Karaköy ferry are only a short walk away.
İlkan and his colleagues were really quick to respond to any queries - I had a slight issue with the toilet and they had fixed it within 20 minutes.
Overall, I would highly recommend İlkan's place for a visit to Istanbul.