Hi Jean,
It is not recommended to delete Appdata\Roaming folder as it typically contains settings, temporary and cache files for many of your installed applications. In fact, once you look for the sub-folders under the name, you will find other folders related to different application installed on the computer.
If the folder is consuming too much space on the hard drive, it could be due to some of the files related to certain application installed on the computer which you may not know about. You might browse around a bit and find out which one it is in the folder. If any of the file name that looks or related to any application which you do not use or require on the computer, you may go ahead and uninstall the application from Control Panel.
Hope the information helps.
Please let us know if you have more queries on Windows.