I received an upgrade from a mountain view room to a lake view room, which I appreciated very much. The owners and staff were very friendly and helpful. I highly recommend Hotel Rigi Vitznau to anyone visiting Vitznau.
If you are umming and ahhing about going, just go. I've seen a review saying it was crowded, but October 2023 it was not, it was very quiet so if you want a bustling vibe it's not for you! I think in summer it may be more of a popular spot.