I seriously love all the different aspects of this game, but while we do sometimes get some additional expansions, I just feel there is still not enough room to use all the pretty decorations to full effect.
To build the factories you need so many houses and they end up sitting on top of one another, which is not very attractive (neither are the more modern high rises).
Right now I feel I can't even start properly decorating until I've built all the factories and bought all the expansions. (The latter being ages away even with spending loads of Tcash).
In conclusion, I just wish there were more room to really get creative with all the decorations and that we wouldn't be forced to build so many ugly houses.