From http://elderscrolls.wikia.com/wiki/Werewolf under Skyrim Bugs:
Sometimes after you cure yourself from the companion quest, you will still will have the side effects (No "Well Rested" perk and comments from NPCs) of the disease but not be able to transform. The player can use the following console command to partially fix this (the counter for werewolf will be stopped and the player can get "Well Rested" perk. However, the NPc still comment about the "Fur from your ears").
