My dream house would have a wing that was totally dedicated to my rats. It would have have a big enclosed area where I could let them run about. The hallway to their room would be decorated to look like a sewer pipe, just for the hell of it. Their room would be furnished with tons of little tunnels and nooks for the ratties to hide and play. In the center of the room would be a large, ornate throne where I could sit and watch all my minions run around and I could oversee my kingdom of rats. Then I would really be the Rat Goddess. Haha! My house would also come with it's own exotic animal vet and private chef that could make all my rats favorite foods.
Obviously this isn't all I would want in a dream house but it would be a great start.