It's not restricted to vloggers by the way.
From what I know, if you hit 10,000 subs, you have access to the youtube space, but what i heard is applicable in LA, not sure about the rest of the places.
EDIT: After accessing the page, it seems that each Space has their own requirements/prerequisites for being able to use the facilities at no charge at all. It's a good step forward for people who have no knowledge or funding to be able to use the state-of-the-art gear that professional productions use.