Küsnacht is my favorite town in this area of Switzerland because it's only about 20 minutes from Zürich, and is easily accessible by car, train, or even a ferry because the Sonne has their own boat stop. The Sonne is a really nice hotel, especially during the Spring and Summer months when the sun is shining and you can dine outside on the terrace overlooking Lake Zürich.
The service and staff here are extremely polite, friendly, and very informative. The rooms here are in my opinion flip flopped because the less expensive rooms are nicer than the junior suites! The first couple of times I stayed here I had a regular room that was on the side towards the Lake, and it was perfect. It was clean, bright, had a great view, and temperature control. The bed was comfortable and the shower didn't flood the bathroom floor, which is what occured when I stayed in a junior suite the last time I visited. Besides the water getting all over the floor, the junior suites are darker, have a cold feeling, maybe because there's no temperature control, and they are also louder because the bathroom fan shuts off when it wants to. The beds aren't comfortable, and the decor of the room is just bad. If you stay at the Sonne book a cheaper room because honestly, they are better than the suites.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC