Bit late to this, I see you've already found something, but for furture ref there's also 'Les Sybelles' in the Maurienne valley which has a good choice of s/c accommodation, at very reasonable prices compared to the bigger resorts. The bookings central has English speaking staff who can put quotes together for you. I can send their details if anyone is interested, just pm me. I live in the area now, and can really vouch for the ski conditions and resorts, little known in the UK but really nice.
We've skied a couple of time at St Sorlin d'arves in the Maurienne Valley - and going again next Feb. It's become our 'easy resort' cos we know the apartments and the route and don't need to spend weeks chosing!
Would definitley recommend - Nice little resort and can easily be done on the cheap if you self cater. We drive down and get there Sat afternoon.