Ruth was our tour guide, a lovely lass from Dublin, Ireland who had moved into the area a number of years ago. She was so lovely and helpful, including helping me to work out how I could get to Zugspitze the next day by myself (as they had no tours running). Full of useful information, and the kind of gossipy stories about king Ludwig that you wouldn't get on the regular tour, she's was a delight, we did Oberammergau, and Linderhof as part of the tour, and the combination as well as being driven through some delightful scenery, was worth the money. There isn't a lot to see in Oberammergau, but it was the perfect place to stop for lunch, and Ruth recommended a good Bavarian restaurant to us. We had 6 people in the morning, and then there were only 3 of us in the afternoon, so it was a perfect number to work with. I only booked my tour about a week before, while I was already in Germany, but Astrid was super helpful by email.
I will say that when visiting the castles, there are a lot of stairs within the castle itself, so be aware of that if you have mobility issues.More