What are the possible grants/stipends/scholarships that are available in the Republic of Austria?
Austria has an official agency for International students, called the OeAD, which, in turn, offers a database of possible funding sources for academic purposes at https://grants.at
Grants.at allows for a granular search. You can select your nationality, state that you are an incoming student, and choose the option of funding of a full study programme.
Here is an example screenshot if you are from Russia:

Good luck (and congratulations on getting accepted at the CEU)!