Hi everybody,
At this picture from link you can see there are some people inside: link
I don't know anything about nowdays of Duck House, maybe I've passed something...
Look what Norbert Muller wrote me about this question:
You can then see the Lake House from the boat exactly as on the picture. Yes the Duck House belongs to someone and they live there. Not in the wooden chalet (cover of Made in Heaven Queen album) but behind, in the gray-concrete building. It was also in this gray building that Freddie used to stay sometimes and have parties in the garden with friends. There is another place in Montreux where Freddie lived the last part of his life. It's an appartment on the last floor of a nice house by the lake side. I dont have a picture unfortunately. It has been bought after he died and cannot be visited. Nor can the Duck House