Haven eaten at this restaurant twice, we have had two very different experiences here. The first time, in August, we had no expectations (except the bib gourmand in the Michelin Guide), and were pleasantly surprised by the tafelspitz and the service. Our second visit was last week, but this time we weren't as impressed. The service was slow/non-existant, and allthough the main courses were well-prepared, the desserts were a disappointment: creme brule which was more like a runny custard with a caramelised cover, and served with a nougat ice cream which didn't complement the flavours at all.
Would recommend the savoury dishes, but try to avoid Sundays - these seem to be the busiest.