I haven't dumped a bunch of money at all into this game and one day app developers will figure it out for themselves. Sooo, I will play until I get bored.approaching soon because it's nothing but grinding now. I would like to get some nicer looking London and Paris buildings and I wish some of the Tokyo buildings retained the simple Japanese appeal but the same population, instead of skyscrapers. I am dozing and rebuilding some to get nicer looking buildings but variety is good to me. My city looks like hodge lodge because I play for population growth over visuals. Some of the most attractive cities I have seen, sacrifice space and population for visual appeal. Take screenshots before you make a lot of changes so you can put things back if it is just not working out.
Look at other cities which have high population and an appealing look to get some general ideas on layout. However, you can play around with design some before taking a huge hit. That's where the sacrifice is the largest.
The ability to move roads as well as buildings. Playing around with design for more visual appeal is something almost everyone wants at some point.