Good place to stay. Not really close to the main sites (40 min walking), but close to places of night life, kebabs, shopping etc. Close to Taxim Square where you can catch a shuttle to Sabiha airport.
The room is fine, but it needs a bit of redecorating (there were stains on the wall, but nothing critical). The bathroom worked just fine. The room is close to the reception and sometimes we could hear people checking in, but nothing major to worry about.
All in all, I recommend this place to stay