Downstairs bathroom is unlit.
Kitchen is cramped, and I'd suggest using something other than the wood used in walls for the counters. There is also a torch on the wall, which I assume is left-over.
The walls upstairs are the same material as the floor. Change one or the other, or both, so they don't blend together. Same with third floor. I also suggest using a pattern or dual materials to break up monotony of the walls.
You have a lot of small potted plants just sitting on the floor, not on tables, small bookcases, or anything.
Bedrooms are pretty bare, though they are a bit small to add more.
You have a false wall concealing an unused room. If you can, find a way to use the space.
Perhaps add some arches/support under the overhang on the east side.
I suggest replacing a small amount of sandstone with sand (but not necessarily chaotically), as pure sandstone seems boring.
Trim the roof on the west side. It doesn't really make sense for one roof to have 2 wool at the peak and the other to have on.
X
X X
XOX versus XOX
X X X X
As a note, in your third-floor game-room, you have the option to replace the yellow wool under the blue carpet, as those are purely interior, and are not visible from the exterior.