We stayed at Kono Kono for three nights. The Bungalows are absolutely gorgeous. They are spacious and beautifully decorated. The staff is very friendly but takes it time, as usual in Tanzania (pole pole). That is probably one of the only negative point - something I would not expect from such an expensive place.
The beach is very nice - there was just a lot of sea weed during our stay. But this is depending highly on the season.
Dinner at night is served at the beach and is very lovely.