Oh, sorry. I thought you had wanted to delete the sub-folders initially, which is why I wrote it to extract to the main subdirectory.
If you want to end up with the extracted episodes in the sub-folders, then probably this:
$ cd Best.TV.Show.Ever.S01
$ for DIR in `find . -type d`; do
> cd $DIR
> unrar e *01.rar
> rm *.rar *.nfo *.sfv
> cd ..
I think that should delete the .rar files as well as the .nfo and .sfv files, but leave the extracted files in their respective sub-dirs.
Happy to help.