The best part of my stay was a shiatsu massage. It was arranged through the hotel, but with a woman who works for herself. She has nearly a decade of experience working as a masseuse in Japan and Italy. I can say honestly that it is the best massage I have ever had. I went in with issues with sciatica caused by tension in my back. After the massage it was completely gone. She even spoke with me for 20 minutes after the massage about what she noticed in my body - where things were tight and exercises I could do. It was given in a downstairs room shared with a tanning bed, but none of that mattered. I cannot recommend it enough!
The hotel was also lovely. Our room had a view of the lake, the shower was on point, and the room was very clean. It wasn't the hands down most comfortable bed I have ever slept in, but it was plenty nice. And the breakfast was really outstanding - especially for this foreigner. I can't get used to the tiny Italian breakfast, and this was not that. There were offerings (presumably) for those with an English and German predilection. If I come back to Molveno, which I surely hope I do, I would happily stay in Hotel du Lac again.