The most important condition for opening holiday apartments in Bavaria is that the incidence rate in the area (Berchtesgadener Land) has remained below 100/7 days continuously for at least 5 days before opening and also remains below 100 for a continuous period. Today (May 13th) the incidence rate implements that order after being less than 100 for a week and is currently 77,6.
From 21st of May the possibility to travel is available for those who have been vaccinated twice, have already had Covid-19 or have a negative PCR test (less than 48 h) at the time of arrival. You are welcome to the Alps!
You should inform yourself about the complete regulations on the official website of the Bavarian government: https://www.bayern.de/coronavirus-in-bayern-informationen-auf-einen-blick/
About the rates in Bayern you find here: https://interaktiv.br.de/corona-newsletter/
and BR news about Corona can be found here: https://www.br.de/nachrichten/deutschland-welt/coronavirus-in-bavaria-assistance-in-english,RtO8eS2