My spouse and I are planning to visit Austria in August. We would be probably be flying and staying in Wien, as it's easy to get a direct flight + hotel package there. Wien would serve as our base of operations for the visit.
We would like to visit the wine country surrounding Wien at Niederösterreich. Our plan would be to visit different vineyards and attend wine tastings and buy bottles of local wine to bring back home.
Are Austrian vineyards open for visitation, or do we need to book appointments beforehand?