We finally have an official description of what it's like!
Quote:
J.K. Rowling: The Hufflepuff common room is accessed through a portrait near the kitchens, as I am sure you have deduced.
J.K. Rowling: Sorry – I should say ‘painting’ rather than portrait, because it is a still-life.
J.K. Rowling: It is a very cosy and welcoming place, as dissimilar as possible from Snape’s dungeon. Lots of yellow hangings, and fat armchairs, and little underground tunnels leading to the dormitories, all of which have perfectly round doors, like barrel tops.
Sounds like Bag-End!
From a webchat with her (contains spoilers):
http://www.the-leaky-cauldron.org/2007/ ... transcript
Sorry if this has already been posted. I looked and it didn't look like it.