Assuming you please the head of the guild enough...either by trading with him or completing all the quests he asks you to do, you get the option of building a house wherever you please but each house has different sets of furniture and vary in size.
E.g with Fighters you get a small castle, complete with 8 guards, a stable.
Now your castle has 3 rooms- the main room complete with roaring fireplace/large table and weapons/armour racks so you can store weapons armour.
You have your own cook in the kitchen and your bedroom.
If your a mage you get a spiral tower buildings(2 floors) and a potions cabinet/bookcase/ chest and a few bottles of wine as well as a cupboard. A do not disturb sign appears at the egde of your property.
A Theif gets a decent house but with lots of hiding places to conceal weapons/armour instead of a weapons/armour rack.
An assassin gets a fairly rich house with tables to store posion potions. The assassins home is rigged with traps in case the owner finds himself under attack. The assasins weapons are stored on the walls.
A ranger has a small hut built in the woodlands in a fairly secluded place. Contains lots of plants/pots and a hammock instead of a bed. 1 giant room where you have a homley fire, table and a bow/sword rack, a few dummies to store leather armours.
The merchants house is very grand indeed where you have 2 stories and quarters for your servants and where you have a butler/cook/4 guards and a gardener. Ask the butler for whatever you wish(food wise and he will bring it to you).
