Due to the particular circumstances with the COVID-19 pandemic the Federal Ministry of Social Affairs, Health, Care and Consumer Protection issued a regulation, which allows the entry to Austria under special conditions.
Information regarding acutal entry conditions for Austria (especially if the entry at the moment is permited or a PCR test has to be presented and a quaratine period undergone) can be found on the OeAD website.
The regulations for the application for visa or a residence title - as given on this website - are still in force.
>> Further information on Entry and Residence
>> Q&A Visa and Residence titles as well as actual Entry Conditions for Austria