Not clean and super uncomfortable beds. Everyone raves about the staff but only one person was accomodating. Walls were paper thin, I heard peoples alarms in the morning, spitting in the sink, kids screaming, etc. If you are a family that needed the kitchen and space, sure but not for a couple.
We requested a double bed but got two single beds.
The toilet was not glued to the tiles so it moved every time you went to the toilet.
The furniture were very outdated and did not feel very clean.
Only positive thing was the location, şisli is a good place.
I have been in Istanbul 6 times, so the best place to stay is definitely Eminonu or sirkeci, basically next to each other. There you have all the connections, marmaray, tram, metro, busses, etc.
