How easily do you tolerate a friend who later becomes a roommate?

I hear a lot of horror stories of friendships ending after co-habitating. I've been living with friends for about a year now and it's been wonderful! A lot of time it seems too good to be true, really. Fair chores, easy conflict resolution, everyone gets the privacy or socializing they need from each other.

Is this more common than I think? Or are we a bunch of unicorns?

How easily do you tolerate a friend who later becomes a roommate?
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