I know a foolproof way to make a bad house in minecraft look nice: Step one- build it high up, floating, on a cliff, on stilts, I don't care. Step two- section off space for bedrooms, storage rooms, a kitchen, a useless bathroom, whatever. Step three- add as many decorations as you can. If the floor is made of dirt, plant flowers. Hang pictures on the walls, add paintings, flowerpots, banners, tie iron golems to the fence. Ta-da! Enjoy your lovely house!