Steven's apartment is great. The living/kitchen area is huge and was perfect for group meals in the evening. The kitchen is very well equipped and the dishwasher is a lifesaver. The beds are very comfy and the house is well heated. The shower is very powerful and gets as warm/cold as you could want it. The neighbours are very very helpful too. It is unlikely that any concern won't be addressed. Our group of five people in our mid twenties on a skiing holiday was perfectly at home here.
Also, the location to the slopes is absolutely incredible. Literally a minute away. I couldn't imagine staying in a better place in Leysin for skiing.