I have always said if I could only keep one Hoya, it would be Hoya cumingiana.  People think that I am crazy, but for me there is no faster growing, easier to flower Hoya than this plant.  I have had many cumingiana plants over the years from three to six feet tall.  They make incredible specimens in a relatively short time.  I believe they should only be grown fastened to a trellis as I have never seen a hanging one that measures up to a well trained trellised plant.  Here is a freshly opened flower photo taken this morning: