@Cherry_sakura How many days are you planning? I'm a bit worried that the distance from Budapest to Hallstatt is too far. We plan to leave Budapest in the afternoon and I'm not sure if it will be difficult to drive at night ?

You'd better contact the hotel to confirm your check-in time in advance. When we arrived in Hallstatt that day, it was already past 7 o'clock in the evening and the hotel front desk had already closed. It's better to call in advance. In Europe, it doesn't get dark until around 9 o'clock.