You have installed Android Studio and now looking for Android SDK and other things.
AppData folder should be inside your user directory.
You are worried that you are not able to see AppData folder inside your user directory. Don't worry, it is hidden. You can easily make it visible.
To show AppData folder follow below steps:
Step 1: Go to Window Control Panel
Step 2: Click on "File Explorer Option" [View small icons if not visible]
Step 3: Click on "View" tab in "Folder Options"
Step 4: Select "Show hidden files, folders, and drivers" radio button.
Check again, your AppData folder is there in your user directory.