I DIDN'T REALIZE IT WAS CLOSED NOW. I FOUND THIS ONLINE:

"This museum does not seem permanently closed, as in its owner does temporary exhibition here and there.

It took a while to find but the most up to date I do seems to be on their instagram page, instagram.com/lemuseedesvampires

There I found something you might find interesting: Sous les pavés offers lots of unexpected guided tours of Paris, one across the Père Lachaise cemetery for example."

ANOTHER FIND: "If you want to sée vampire, dark créatures who sucks people life, I recommand Assemblée Nationale."