I've been using blender for quite sometime. But I have most my "Disabilities" in the NODE/Material/Lighting area.
I tried most REDUCE NOISE tutorials, tried TOP X Tricks to take out fireflies, but it seems that each case is a case and I cannot achieve approximate results to other people in the same sample size. For example, a person achieves a perfect render a 50 samples. I would have to put 500 samples to try achieve the same result... It's very frustrating.
The lighting inside the "DEN" seems too low, compared to the outside light intensity.
I have a Intel 2600K Processor, G.Skill.Sniper.8GB.1600Mhz RAM, GTX970 G1.Gigabyte Graphics card.
Blender File: http://www.mediafire.com/download/8gd70c8aonbr4ss/BEAR-Radio.blend (might be missing one or two texture images for the Radio. Just delete that material and it should assume another Radio Material)