I enjoyed my stay. I was very comfortable as the building is secure. It was walking distance to Galata Tower and Istiklal which was great. The place is comfortable and an appropriate size for one person or a couple. The water was hot for showers and the bed was comfortable. Communication with host was quick and clear.
The wifi was not great, so I used my data a lot. There is no sound-proofing, so expect to hear noise from the street and other units. It was not terribly disruptive for me, but something to note for light sleepers.
I found it was not possible to get Uber from the location because the map seemed to be inaccurate in the app, so I just walked out to the street and got taxis which was quite easy as it is a busy street. The private transportation was not reliable as it was late, both from the airport and to the airport which is very bad, but this is not the host's fault as it was another company booked. Overall, I would stay at this place again, and be prepared with mobile data and another form of transportation.