Stayed here with my son mid January. We didn't get into town until late so all the standard rooms were full. We were able to rent the cottage for the standard room rate which, being rather late and the middle of winter, was a fairly agreeable rate. Very comfortable, quiet, and the view of the lake in the morning was rather beutiful. My wife would have loved it.
This place is a scam. Fmuth is a tourist trap and zehnders "world famous chicken dinner" is a load of bs. Avoid it.
I'm a local. The food is good, the beer is great. Sometimes we'll stop by when the weather is bad or a very slow or off day. Most weekends and holidays this place is packed beyond capacity. Make no mistake though, fmuth is a tourist trap.