Requirement #1: Very steep pointy rooflines. And mossy stone.
#2: Round windows and Snow White chimneys
{Check out that perfect fairytale woodland chimney!!!}
#3: A bit of German Black Forest-style fachwerk
Fachwerk + chimney + pointy roofs + diamond beveled windowpanes + wisteria vine-tree over the garage! A-plus.
And a tower will automatically do the job.
Especially with a hobbit-style door.
The historic neighborhoods around campus are disgustingly cute.