Option one:
Disable sun and use only GI for lighting.
Option two, what I have used for scenes like the one you posted:
Add a surface where the ceiling should be, on the side facing the interior, apply a material. One the side facing the camera, apply a transparent material.
That makes it opaque for shadows and external lights, but the camera still sees inside. You then need to place lights inside to light it.
model the entire lamp profile and create the object as a revolved shape.
the shade should be a simple single plane so you can apply a 2-sided material
3.Go to the Chaos Group youTube page and watch the video on 2-sided material setup.
I would use a copper metal material with a noise displacement map to get that hand crafted effect. This may take some time to figure out.