The stay at Marion was excellent. The room is big and very comfortable. It has all the commodities one generally needs. Moreover, the house itself is big, really clean and decorated in a way that makes it very comfortable. In terms of location, you are 3 minutes walking-distance from Sallaz, which puts you in the center in around 10 minutes.
Marion and Florian are really nice people, very sociable and helpful. They even helped me move to the place where I am now staying permanently.
Also, they have a sweet cat named Molly who comes at night and stays a bit in the living room :)
Overall I had the nicest stay, would definitely recommend it.