We stayed in a wooden shed at La Camping Pla in Canillo (Grandvalira-Canillo) over New Year 2008/09 and had a fantastic time. The shed had two double bedrooms and a small bunk bed room, lounge/kitchen area and an adequate bathroom. We left the heating on all day so when we arrived back from skiing the shed was super warm. The campsite is a 5min walk to the Canillo gondola which serves the Grandvalira ski region and links up to El Tartar, Soldeu and Pas De La Casa. The lift system is superb with hardly any drag lifts and super quick 6/8 man chairlifts, even the short lift links are connected with handy rope pulls. Although the piste map is slightly confusing all the resorts are linked together with blues and reds. For the advanced skier there is not many challenging runs and many of the blacks are no more than reds.
I would recommend Grandvalira to any beginner or intermediate skier. The only drawback was the horrendous price of the ski pass: £220 per week for half the amount of lifts that some French resorts offer and the high cost of food in the mountain restaurants, which seems to be the norm for us British skiers although it is still outright piracy.