Had a superb Christmas 2009 experience in Belle Plagne. Village really pleasant (if a little expensive, but there's the euro for you!) and apartment was superb. A little way out of the village, but could be easily accessed by stairs, that are a bit of a challenge on the first few days (I blamed the altitude), but not an issue. As it was the first week of the season, the apartment was spotless, included really well placed ski lockers and had a superb view of the valley and ski area. A group of four opted for the luxury of a two bedroom apartment, that could potentially sleep 7. Think that would have been a bit of a squeeze and the bedrooms weren't huge, but was an excellent base none the less. Had a reasonably equipped kitchen, dining and lounge area and had two bathrooms, one with shower, the other with bath. The only down side was only one loo, which wasn't too much of an issue, but could have proved interesting with a group of 7! Thanks to great snow conditions you could ski from the front of the apartment, with a reasonably easy blue run down into Bellecote (just gun it!) which then linked to the majority of the ski area, or there were some lifts in Belle Plagne that linked to a number of runs or the bubble up to Roche de Mio, or down to Bellecote. Ski School was literally out of the door and our second Level 2 instructor, Jean Marc, was excellent, but I would air on the side of caution when picking levels to go into. On paper we were a Level 3, and by the end of the week were still doing Level 3 things, but for a group of English, straight off the plane, after a long day previously, being sped off down the mountain with no assessment, on difficult runs, was not an ideal day and led to an injury :( So if you've not skied for 8 or 9 months I would suggest going a bit lower, you can always ask to be moved up if you're finding it too easy.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC