I'm going to be in Lausanne from April 30-May 18, and am looking for a furnished apartment from June-August (possibly to October). Is there anyone leaving for the summer that would like to sublet their place? I'd like to look at it during my stay in Lausanne in May.

You could try these people:
http://www.oklogements.ch/
http://www.residencedumidi.ch/chisiamoUK.htm

Or alternatively, try this list published by the tourist office: http://www.lausanne-tourisme.ch/Data...bjDir/2463.pdf

Good luck!