If you can afford it, I would definitely recommend the Hotel Beau Rivage. Located in Ouchy, the lakeside of Lausanne, it is a luxurious hotel with stunning views on the Lake and the Alps.
If this is not within your budget, I would still recommend for you to go their outside Cafe and enjoy a coffee/tea on a sunny afternoon....
The first class service, the beautiful rooms and building, the location and of course the views.......
A nice hotel, reasonably (if that word can be used to apply to Switzerland) priced considering that it's right by the lake. The bus stop is right outside and saves a long walk into town. At the desk they gave us a free 24 hour bus pass which we could use as often as we like. Reception staff were extremely friendly and helpful.
1. Great view of the lake from the 4th floor. It costs a few dollars extra but we reckoned that since we'd be forking out anyway, we might as well go the whole hog. It faces the back so was quiet, but I guess that rooms facing the street might be a little noisier. 2. Free parking! 3. Bathroom towels nice and thick.