We enjoyed our stay at this Airbnb. Can't beat the location!
The apartment was great for two people and is right by the Galata Tower. There are lots of restaurants and small markets nearby, and lots of activity around the tower...but the apartment was quiet once inside.
The location is near both a Metro station and the underground funicular, called the Tünel. The funicular can take you down to the tram. We got around Istanbul on a combination of subway, tram, funicular, and ferries using the Istanbul Kart. To go to/from the airport, we used a taxi, which was easy to flag down in our neighborhood.
Communication was very good with the owners. The apartment was very clean. A laundry room with washer and dryer was available on the floor above.
The view from the roof was amazing, though a little scary to get up there.
The air conditioner worked great!
The only thing I would recommend to the owners is to upgrade the bed linens and provide two pillows per person.