Communication with the host was excellent, as was the flat location. Only a minute or two (uphill) to the İstiklal street, and a bit less than 10 minutes (downhill) to the Tophane tram (T1) and bus station. The flat is on the 3rd floor, view from the balcony is non-existent.
As is stated in numerous reviews, the bed is terrible. If you move an inch, the whole bed moves 3 inches. The mattress was the softest I've slept on, which was far from perfect. When we arrived, the kitchen had not been cleaned. There were bits of breadcrumbs, cheese and tomato seeds still on the counter.
And then there were the little things, like broken shower doors and the toilet seat lid, which would not stay open...
All in all, it was OK, I'd give it a 4/5. As said, perfect location and communication with the host, but still some downsides in the flat itself.