Today I placed someone in archives under remark, "I was not available". It then showed a comment that my calendar will reflect this... What does that mean? Do you automatically block out that date? Can I see it or does just potential owners see it? Sometimes the choice of what to put does not truly meet what is happening but is the closest.
Yes, your calendar is visible to both you and your clients, as part of your profile. The best view of it for you would be to go to your calendar page (click on your name near the top of whichever page of the website you are on, then click on Calendar on the drop-down menu). Here you can change what the calendar shows is your availability. And I, too, have had situations that didn't fit the list of options for archiving requests. Just pick what seems the closest.
Clients can (and should) look at your calendar, but they don't see the reason you declined a stay. You may manually go back into your calendar and mark yourself as available even if Rover has marked you otherwise.