Thats funny, because your partition has no space left (100% being used):
I believe that this user (dtorres) has used most of your space.
Also appdata looks a little bit big. I bet you have previews enabled and if you check inside of appdata folder preview will be the biggest one. Example of command under appdata folder:
du -ah --max-depth=1 . | sort -hr
27G ./preview
27G .
2.9M ./js
1.4M ./appstore
704K ./css
664K ./avatar
228K ./theming
204K ./dav-photocache
124K ./identityproof
20K ./external
8.0K ./richdocuments
As you can see my previews folder is huge, but this does not disturbs me → Previews / data size