@David-And-Kevin0 I have also been closed since March 2020.
While we should want as many people as possible to be vaccinated, from all I have read concerning vaccines, having had the vaccine does not prevent people from contracting Covid nor passing it on to others if they do get infected. All it does is trigger your immune system to attack the virus, so that you don't end up in the hospital or dead, you will instead have a mild case.
So guests being vaccinated, as I see it, doesn't really prevent them from leaving Covid virus in your rental, or passing it on to you, if they happen to be infected. Because you are vaccinated, or future guests are, if you were exposed, you wouldn't have a severe case.
But vaccinated guests and vaccinated hosts are no assurance that none of you are carrying the virus and could pass it on.