We had good luck with the Stoney Creek condos a few years back. Wasn't actually multi-family but was my wife and I plus my 2 then-teenaged kids. I think we had a 2-BR with somebody on the couch.
Nice location. You can walk to the main part of the village and the lifts in about 10 minutes, or there's a bus. You're right across the street from the Marketplace with the supermarket and some restaurants. It's in the "Village North
" section (location #3 on the map that comes up at that link). Available through Whistler Central Reservations and probably some of the others. According to Whistler's website the units are managed by ResortQuest, Whistler Premier, or Whistler Retreats (since they're privately owned, it depends on which management company each owner uses).