Furnished with antiques and reproductions, these rooms aim to give you the feeling of truly being in the 18th century. Don't worry, though--they all have modern amenities like private bathrooms, phones, and televisions.
You can book a twin room here--something of a rarity in the US. Unfortunately, though, for those who want to get 4 people in a room, there's no such thing as a room with two double beds.
Many rooms have decorative or working fireplaces, and you can call housekeeping to have a fire laid if you want. If your room doesn't have a working fireplace, don't worry--the common area of your building will probably have one.
Williamsburg is one of those places that shows best in the morning or evening, when most of the tourists are not yet about, and this is the strongest argument for paying a premium to stay within the historic district--as you walk to breakfast or to your room in the evening, you feel as if you may really be back in another time.
NB-The Lodging section of the Williamsburg website has a description of all of the rooms in the Colonial Houses--for the best location, try to get a house off Duke of Gloucester St, which is right in the thick of things.