So it looks like Austria as of this coming Tuesday will reduce the vaccine booster validity numbers down to 180 days, but will allow a negative test to suffice to enter for tourism purposes without quarantine, if I'm reading things correctly. Domestically, most restrictions on restaurants, museums etc will be phased out over the coming weeks, though I believe masks in public transportation will stay, as of now. If the vaccine mandate for Austrian residents and citizens goes into enforcement mode (I believe the law is on the books but not enforced yet) that would set up the situation that unvaccinated tourists who come into the country with just a negative test would be able to wander about the country but citizens of Austria would be held to a different standard. I can see where this could lead to some problems.
Anyway, things looking promising in Austria, and if in fact even the unvaccinated are allowed in with a test it marks yet another recent country to allow them in, joining Norway and the UK.