Location is just perfect. Between the city center and the quai.
We got a free ticket for using the train, metro and buses of Lausanne for the complete time of our stay (4 days), which is included in the price of the room.
The breakfast buffet was ok. And the view was awesome (9th floor for breakfast).
Of course the air conditioner was great.
On our last complete day, some towels were missing. We probably could have asked at the reception (very nice personal), but couldn't be bothered for just one night ;)
All in all, great place. Really recommend it.
If you come by car, make sure to reserve a place in their underground parking, since there aren't a lot of spaces (~20). And parking around the hotel isn't easy.