I think a larger house like she's living in makes it a lot easier to mitigate "the bad room mate" problem mentioned in a lot of comments. They likely have some filtering and process to kick someone out if they turn out weird. And recruitment is hopefully easier if you have 4 other people looking for a 5th than posting an ad somewhere.
This does seem like a potential solution for the male loneliness epidemic. I think it would be harder to check out if you're around other people. Their house seems _very_ women-styled with cooking dance parties, twerking in the garden and the ingredients. But that's just one house, each house has their own style.
Before I met my partner I looked into communal living spaces, and if this doesn't work out I might do so again, and give it a shot. I don't think living on my own is good for me long term. I get too isolated.