I live in austria and I have a friend who is a UK citizen , he has to come to austria and has to quarentine(he isnt fully vaccinated). he will quarentine at an apartment I rent(its completely empty no one else lives there for now). but can I meet him at the bus station and direct him to my apartment or better even come with him to the apartment  ?

I live in Austria and I have a friend who is a UK citizen. He has to come to Austria and has to quarantine (he isn't fully vaccinated). He will quarantine at an apartment I rent  (it's completely empty no one else lives there for now). Can I meet him at the bus station and direct him to my apartment or better even come with him to the apartment?