I feel very privileged to have flowered Hoya vangviengiensis and don’t expect to be able to do it again in the future. It loves cool, humid conditions and as such does not make a very good houseplant here in the Northeast because of the dry air in our centrally heated houses in the winter time. I have tried growing it on a windowsill during the winter and it shuts down completely without the humidity. The flowers are very powerfully scented especially in a cool enclosed area like my basement grow tent.
For someone wanting a challenge, or who lives in a naturally cool, humid area like say San Francisco, I can highly recommend the plant!