An amazing location, it's central to both Taksim Square and the Old Town area to the south. If you don't want to walk to the Old Town area there's a tram about 2 mins away. The ferry is about 5 mins away, subway station maybe 8 mins. It's a great area for walking but maybe not so much if you're with elderly people or kids with strollers as the immediate area is very hilly.
The apartment itself is cozy. If your preference is to stay in a more modern apartment then this place might not be for you. I'm guessing that most places around the Galata towers will be older looking inside. The bed itself was soft, not a positive or negative, just for people's personal preference. if you're a light sleeper you should bring ear plugs and an eye mask as the street can get a bit noisy. We brought both and had good sleeps. The washer was helpful and A/C worked great.
Çinar was also a great host, he was very helpful, met us at the apartment and helped carry our luggage. He gave us great food recommendations, so definitely ask him for that.