I stayed in the apartment for two months and had a wonderful time. Communication with Mersin went smoothly. He's a very respectful and considerate host. His assistant Ergun is also very friendly and even helped me with my luggage when he didn't have to. During my two months stay, there was only one time when I had trouble with the heating. I wrote Mersin about it, and his assistant Ergun was able to fix the problem within minutes.
The apartment itself is nicely furnished. The beds are comfortable, and there is enough space and storage room for everything. The kitchen has everything you would need, even for an extended stay. All necessary appliances are provided.
The location couldn't be better. The neighborhood is quite lively. There are public transport stops nearby, and even when walking around, one would always find the way back to the apartment as it is right around the corner from Galata Tower.
I would be happy to stay there again and recommend it to everyone.