We stayed 5 days at Berna's place beginning of June. The apartment is great, ideally located, 5 minutes walk from Taksim Square.
The place was very clean, with everything we needed. The 2 terraces are a plus. The whole building is very quiet, you can sleep with windows open without being bothered by noise.
The communication was excellent.
All in all, a very good Airbnb flat which I recommend.