First of all the positives... the staff at the "hotel" were very friendly and responded promptly when we asked for towels, etc. The check in process was also very quick and easy as they have an office on the first floor of the building. The location was also central.
The reasons for giving a bad score for cleanliness and accuracy are as follows:
When we checked into the room it was not clean, there were strange hairs on the sofa and floor. This felt pretty gross but we didn't want to complain so we did some extra cleaning ourselves to become satisfied.
As far as accuracy goes, this was our biggest problem. It was very hot in Istanbul when we visited so air conditioning was a priority. After we checked in and turned on the air conditioner it was not blowing cool air. We tried different settings and waited to see if it would start working better. After an hour it was the same, just blowing room temperature air or warmer. We sent a message to the staff and they checked for an alternate room with a better air conditioner. They said they had one but we needed to wait one hour for it to be cleaned. After waiting we went to the alternate room and turned on the air conditioner and then went out for dinner, trusting that they had solved the problem. When we returned from dinner the room was even hotter than outside. This air conditioner was no better than the one in the first room. As it was almost midnight we did not want to wait and change rooms again, so we had a horrible nights sleep in the heat. The next morning instead of changing to a third room or fourth room to see if it had a working air conditioner we decided to check out and ask for the second night to be refunded. We did not trust that the third room or even fourth room would solve the problem, as they did not solve the problem with the second room. Also, as we were there only two nights we thought changing rooms three or four times was unacceptable. The staff refused to refund the room and the manager Yeliz was very upset that we wanted to tell the truth about our stay online. I can see she has already written a review about me, so I am wondering what it might say. :D
Overall this would be a decent place to stay in Istanbul if they replaced the air conditioners or were more honest about this problem in the description.