I like it. The simplicity is really nice (Which is a given, since It's a Demo Build, but the none the less, it's really nice looking) and I like the fact that it really shows off how Ramp bricks, and rounds can be used really nicely.
I think, personally, that if you were to remove the bed and the Jail cell, and say, put in some Candles or even a little archers den perhaps, if possible on the walls, it would look nicer.
That I would agree with to be a Default Demo Build.
Either way, I think it's really nice and should you get the Full Version, you've got some good potential.