We stayed at Bulone Resort for 5 nights in December 2013. Koh Bulone is a very nice island with nice beaches as well as a good walking path to go to other beaches. The owners of the resort are very nice and we felt very welcome. We had a bungalow with a fan, that was what was available when I booked, however if we could we would have opted for a/c. The bungalow itself was "rustique". We liked it, but it is important to remember not to eat anything in the bungalow or leave any type of food there - you will have rats, ants and lizards in there in no time!
The towels and bed linen was a bit too worn out with large holes in them.
The resort has a nice atmosphere, and there was a restaurant where we ate most of the time. Since it was so close to the beach, there were very few mosquitos there as we felt there were on the restaurants further up the hill. This is also where the breakfast was served and it had plenty of choices.
For us, 5 days was the right length of stay.