Ани В.
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We were three adults that went here and we loved it. The entrance fee of 14, 50€ is not that small, but it's definitely worth it. If you live in the region they also have a very affordable yearly card.
You should come here in the morning as you will definitely need the whole day. There area is huge, as every Austria region is represented by a few historical buildings. In between there are lots of activities and not just for kids, but also for 'grown' kids to try out.
The whole museum is built into a forest, which makes the visit feel like a walk in nature and since the area is so big, it also doesn't feel cramped.
When you come by car, there is lots of free parking spaces. The parking lot is a few KMs away from the entrance though. However, don't you worry, how you'll get that. Of course walking is an option, but it's along a street, so I wouldn't recommend it.
The better option is offered directly by the museum itself - a traktor will pick you up and bring you to the entrance and in the evening also back to the parking lot.