1. Housing is in town. If you laid EQ2 it's like housing there. You run to your style of house you purchases in town, run in the door and enter your own or someone else's. Towns are not instanced. They are open world and are built up in levels depending on how much revenue taxes being in and then the mayor/governor in charge decides what crafting stations get upgraded and progress the town. You can not progress into new gear levels and types without leveling those crafting stations, so it's very important.
2. I mean there are quest lines, but the world is ginormous and you can go to any town or hub and do quests in any order you wish. There's no area to area like in WoW and that, though there's obviously zones that are higher level than others. When you get quests from a bub, like from your faction commander, it'll send you to whatever area, and you can choose which ones you want to take. But to touch on the level of zones....there are so many zones, that you can again, take many different paths to that approach if you want.
The reason having options on where you want to go is important, is because even if a faction controllers your town that's not yours where your house is, you can still be there and still quest in those areas. If you need to go to a new town to work on some armor because your local stations aren't leveled, they do a good job of not making it a pain in the ass to need to go back to wherever you originally were to do quests. It should be noted that even with the extremely limited map they have now, in alpha, its huge, and its about 1/10 of the actual world size will come launch...and currently, there are no plans for mounts at the moment.