If you like me ever need to know at a glance how much storgae space you are using in a directory, then look no further than the excellent Tree Size application.
It comes in free version or a paid version with lots more features. But the free version is fine.
This will scan a directory or drive and breakup by folder how much space is used by files and folders.
You can print a 'report' which is helpful, and although the free version doesn't support an export to .csv feature, you can print to XPS for instance and do a little copy and pasting if necessary.