I know nothing about Hoya imperialis ‘Mary’s Cottage’ Palawan other than it came from Joni at SRQ Hoyas and her number for the plant is SRQ 3173 so If you like what you see, check out her site, and get on the waiting list for a cutting.  I have found out however that Mary’s Cottage is an actual place on Palawan Island in the Philippines.  It is a resort with small bungalows that rent for 500 pesos per night.  So I’m assuming that this imperialis was found on or very close to this resort.