any ideas for house improving?

thanks for kind words!;) I rather thought that it's very far from perfect, nice to see that at least these finished parts look acceptable for others. Currently sims are spending more time walking between rooms than doing something, apparently they choose randomly which appliance they are going to use, although it's not problem now due to trait that adds interest rate. I'm looking for some performance advices and possibilities of improving, maybe some users were constructing similar houses (many floors and big rooms)