I found a VERY simple to use 3D interior design program, not CAD based. It uses certain universal 3D file types. Maybe rather than just creating modern interiors one could find files for it that are for medieval style wall textures, furniture, etc. Uploading a file showing something I made in only about 30 minutes.
Here is the website to download from: https://www.sweethome3d.com/ (https://www.sweethome3d.com/)
Link to example: https://www.dropbox.com/scl/fi/ap1jmrv5gp75coq7roxdg/30-foot-2bd-1ba.png?rlkey=pdpv5spc0nvd74ohu59sftt4i&dl=0 (https://www.dropbox.com/scl/fi/ap1jmrv5gp75coq7roxdg/30-foot-2bd-1ba.png?rlkey=pdpv5spc0nvd74ohu59sftt4i&dl=0)