I felt like this was the best place I'd ever stayed in on AirBnB. Everything in the apartment was very minimalist, but exquisitely thought out and very clean. It is easy to get to downtown Lausanne if you like via bus (right outside and running continuously), metro (about a 10 minute walk), or you could even use one of the provided bikes and bike along the lake in about 25 minutes. Our first day we actually walked all the way to Lausanne along Lake Geneva, which took about an hour but was totally worth it for the beautiful scenery and peacefulness.
Also the host, Ramon, was very friendly and helpful (and even left us a fridge full of some essentials, red bull, and beer for our arrival). Usually I find anything other than a self-check-in to be awkward on AirBnB, but I actually enjoyed our walk-thru with Ramon.
I could list further details, but really this place was perfect. It was also a great value, and you should not hesitate to book if you are looking to visit Lausanne!