I had a ton of documentation in a free instance and since I just got an email saying that I need to log in in the next 30 days, I logged in and was greeted by only this:
Spaces appear here after you create or view them.
Nothing in any of the various spaces in the space directory either.
UPDATE
Atlassian has provided a link to me where I could reach my space, even though I didn't see it in either my home or the space directory. One day later, the space had also appeared in my home.