Two words.... "Floor Plan"...
Skip the fancy stuff. Grab a pencil or fine tip marker, a piece of paper (graph paper is nice but not necessary), and a ruler. Worry about scale later. Label it "rough floor plan" if it makes you feel better. 15 minutes tops then snap a pic.
You can edit in something fancy later.
Let's see, Let's see, Let's see...
Did I mention I have patience problems?
