Some general mapping tips:
- Tables don't go on walls (the glass thing next to the fridge is half a table).
- Neither do book cases (next to the piano. Keep in mind that there's a width to these tiles (you can see the tops of them) so they need at least that much room on the floor else it looks like they're floating in mid-air).
- Smaller rooms are better than bigger ones. That way you don't need to fill up space with random stuff.