Thank you so much for all your lovely comments, I appreciate them so much :) Here's where I'm at with my Xmas roomboxes. Their base is 20x20 mm, height of the one with stone fireplace is 18 mm, the other's - 20mm
My husband ordered me some wood (I believe it's called veneer?) from ebay and I'm so happy with it - it offers much more genuine look of the furniture and flooring.
Today I've painted some watercolors that you can see on the walls. They make them look much more cozy:)