Our stay was nice and quiet. Place is clean and all amenities are there, including good A/C and good free wi-fi. Location is very convenient just minutes off Taksim Square.
Cons: Bring an ear plug if you are a light sleeper, because one can hear street noise (not too bad) and noisy neighbors from other rooms and other floors. There seem to be a sewage problem which causes bad smells coming from the bathroom (we kept the its door shut to let it spread in the room).