I have stayed many times at the Bergkristall when my children were little as it is right by the nursery slope. Now the children are grown up we prefer to ski St.Anton, but I go back and see the family Wrann at least once if not twice to eat lunch there. If the weather is sunny they have a large sunny but private terrace where they serve a lunch that few restaurants could beat. They have daily specials that are to die for. I had pasta ribbons (parpadelle) with fresh Steinpilz (Porchini mushroom) and shavings of fresh period truffles. My son had a wiener schnitzel that is to die for. But the choice of fresh fish such as Dover sole, monk fish and lobster pasta just goes on.
But you must book! This place is known by enough people that it is packed daily in the high season and probably low too.
I can also recommend the hotel to stay in as a comfortable well run smaller personal place to stay and they keep updating everything whilst still keeping that mountain charm.More