I fear for giving a modification or improvement tip which might add to someone's Honey-Do list. However, I have benefited from other's tip and some of the forum might see benefit in my tips. So - here goes!
My Berk has a single bathroom with limited vanity space. I found a wall to be quite hollow and have added a shelf as shown in the attached picture.
This shelf addition might be applicable to Berks without the rear bath.