Much information about visiting Auroville is best obtained from auroville.org
This is especially true for information about visiting Auroville as polices change over the years.
You may also wish to be informed on how to visit the Matrimandir to allow sufficient time for orientation and a meditation in the inner chamber.
There is also a link to AV guesthouses. It may be necessary to book months in advance if you plan to go in January or February.