Create a Free Area photometric light (without shadows) in front of the window (it must be inside the room).The size should be a bit smaller than the window. I set the luminosity to 1500 CD. Try to make experiments reducing and increasing the intensity. The illumination depends also on the size and the position of the lights that you are using. You should now have a rendering like the image below.
Rendering with a MR area spot light + free area and max bounce 4
The illumination is quite good for now, but we must give the impression of more luminosity. It becomes dangerous if you try to increase the first 2 lights by too much, as you will run the risk of burning all the renders. We can improve the render by adding a last light. Create a free area photometric light in front of the Room. Normally I delete a wall and create a camera inorder to get a better render of the interior. So now, create a free area photometric light (without shadows) in front of the deleted wall like in the image below.
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The size must be smaller than the size of the wall that you have deleted and don't locate it too close to your room. Leave a small space between the room and the light, otherwise you will burn the surfaces which are too close to the light. I put around 850 CD in the slot for the Intensity. Try to make a test render. You should have a result like in the image below.
