Overall the apartment was a great place to stay during our recent trip to Istanbul. The location couldn't be better, the apartment was spacious and comfortable with magnificent views, and our host was hyper-attentive and responsive to our needs. We got locked out of the unit once and literally within minutes our host sent someone over to get us back in. Would just be aware that the unit is a fifth floor walkup so going up and down with bags can be challenging, but the spectacular views, privacy, and serenity made it worth it to us. You're close to the best restaurants in the city and many of the top tourist attractions like Istiklal Cadessi, Galata Tower, Galataport, etc.
The only reason I can't give a 5/5 is because the unit originally listed having a washing machine for laundry (it doesn't) which presented a challenge for us given we were on a multi-week trip and booked the listing specifically for - among other features - the access to laundry in the unit. Our host kindly offered to provide a laundry pickup for us at no charge, which we greatly appreciated (again, our host was really fantastic). If you don't need to do laundry, then this is the place for you. Would also note that, despite what's listed, there isn't a gym on premises - there's a health club about ~5mins away that offers day passes.
Great spot with a great host. Thanks again to Tunc for all his assistance and prompt communication while we were there.