Just a note to myself, as I always have a hard time understanding the find manpages. To list the directories and subdirectories up to a certain depth, “simply” enter:
find . -maxdepth 2 -type d
Option maxdepth states how deep the subdirectories should be listed, option type restricts output to directories (d).
If a directory listing including size is required, this much shorter snippet does the trick, using du (disk usage), the counterpart to the often-used df (disk free):
du -hd 1
Option h triggers human-readable output, replacing size byte count (5820) with SI prefixed numbers (5.8K), while d limits the recursion depth like before.