I enjoyed watching the waterfall, though there was not much water on the day I went there.
It took me almost four hours to drive there from Sydney, which was not a good experience on that day. The reason could be that I possibly followed the wrong route I knew from the map attached above.
I used GPS to drive to Jones Road, Calga first. There I was told the waterfall was actually on the other side of the valley. Then I found that the link within the map above on this website led me to drive a long wasteful circle, which cost me almost two extra hours.
After consulting with a local in Central Coast, I finally drove to Somersby Falls Road, Somersby, where I found the waterfall.
I wrote all this in a hope that nobody else would make the same wasteful mistake as I did.
Good luck, everybody.