Accomodation in Vienna and arrival in Vienna

Please find more Information here:

https://housing.oead.at/en/accommodation/wien-en

Ibis Budget Hotel Sankt Marx

https://www.accorhotels.com/de/hotel-3706-ibis-budget-wien-sankt-marx/index.shtml

Ries City Hotel:

English homepage

https://www.booking.com/hotel/at/riess-city-hotel.de.html

https://at.hotels.com/ho635505248/riess-city-hotel-wien-osterreich/

MR Appartments:

http://wien-hotels.info/index_en.htm

Josefstadt Appartements

www.appartements-josefstadt.at

General List of Hotels

https://www.wien.info/en/hotels

Booking.com
https://www.booking.com/

City of Vienna page has information too, you can filter for apartments:
https://www.wien.info/en/travel-info/hotels-accommodations

for room in a shared flat:
https://www.wg-gesucht.de/wg-zimmer-in-Wien.163.0.1.0.html

https://www.immobilienscout24.at/wg-zimmer,wien.html

Please find more Information here:

Welcome Guide of the University of Vienna

Alles rund um das Meldeservice

Meldebestätigung

Meldezettel

Immigration law

Depending on your country of origin, different regulations regarding entry and residence in Austria may apply.

https://personalwesen.univie.ac.at/en/services-for-employees/additional-information/immigration-law/