Wow. The crypt is cared for by the monks of the Capuchin church that houses it. Those who passed away later lie in less opulent quarters, but equally watched over:
We're thinking of reading up on the history of this great dynasty, but a look at the size and complexity of this gang gives one pause. It would be a task to figure them all out, especially since like most royalty, they all tend to have the same given names. Wikipedia has a good article, search for Imperial Crypt Vienna.