My AppData folder is using 3GB space . Can i delete the content of this folder safely??i have used disk cleaner etc. already..

I have the same problem with the app data folder but it is taking up 400gb of my drive now this cant be right, there is something wrong with this folder.

I can tell you what is wrong.  Check the microsoft folder it is probably responsible for 90% of your wasted space, because the programmers at microsoft are lazy and incompetent.  They do not know how to clean up after themselves (i.e., delete temporary files).

I finally realise that if you have an iphone , ipad....And using iTunes for Backup data. May be it the main reason for this problem. Following this link : 

C:\Users\User\AppData\Roaming\Apple Computer\MobileSync\Backup 

May be you will meet things you needs.

P/s : How to show hidden folder. You need go to Control Panel\Appearance and Personalization\Show hidden files and folders. Next stick on  Show hidden files, folders, Drivers.

I have exactly the same issue...the app data folder has close to 400GB as well.  I have to poke and search through to see what to delete and what to save?  How can that be correct or even remotely user friendly???

Free some space using other techniques?! what is that? ........ what about my AppData which is 17.0GB it's very frustrating, Microsoft should do something.....we are really need help.