You could try to use this plugin:

https://sourceforge.net/p/sweethome3d/p ... g-2.2a.zip

For best result, select the Yafaray renderer.

To get rid of the shadows, you can apply a white solid texture to the sky, select Enable sky lighting and set the time to midnight.

Most of my images are rendered with 3440 px (width),and AA_minsamples set to 64. I use Ambient occlusion most of the time, and prefer Mitchel filter_type for indoors, and Lanczos for exteriors.
But you should try experimenting with different settings.

Cecilia