There will be housing.
Housing will be pretty basic at first, but after the game has launched we'll make it nicer and more elaborate in the bimonthly updates. Most housing will be instanced, meaning that when you enter the door to your house you're transported into a private little house interior that's exclusively for you.
(If you're wondering how we can have instanced housing but not instanced dungeons, this is a special case. The server can handle instances where no combat is allowed. So you won't be able to fight monsters inside your house! But you'll be able to craft and shop and have visitors and much more.)
Guild halls will have a shared-world public area (where guilds can set up vendors, for instance), as well as a private backroom area for guild members only.