Emma's place is great and Les Diablerets is wonderful! The apartment was cozy and good.
The only thing I'd add to reviews already here is that I think this place would be perfect if you have a car. We didn't have a car, and the walk to the house took us almost an hour each time we did it. It's on a highway without a shoulder, and it was icy while we were there. In summer it wouldn't matter as much. The post bus is very good, but only runs once an hour 9-5:30, so we had to plan around the bus schedule a lot. Everything else about it was good!