I suppose it all depends on how people think dwarves would live.
I imagine dwarves to be a proud race, with over-the-top mountainhalls, complete with 5 story high dining halls, an XBOX-HUEG room for the king/mayor/nobles to sit/attend meetings.
Basically, I imagine that dwarves all fancy themselves to be kings.
And I kinda base my fortresses around that.
This is how I approach my fortresses. My entrances are carved into the mountain side, are several stories of smoothed rock tall, and have giant 4 tile pillers leading up to the roof of the main entrance.
Imagine the inside of Mines of Moria from the Lord of the Rings movie with the giant pillars. Yeah, that's what my dining hall should looks like, with streams of water flowing down from 4 stories above and a clear glass pillar in the center where magma flows down, giving light and heat to the room.
My dwarves ought live in rooms fit for a king (I turn off rent). The king must have a giant hall, again, several Z-levels tall, with giant engraved pillars either made out of marble or obsidian.
There should be a giant shaft that leads all the way down to the depths of the Earth at the center of which is a giant 5 tile wide piller around which stairways lead to the bottom. Across this pit there should be giant 5 tile wide and 10 tile long bridges that can be retracted to separate the levels off from the main stairway.
At the bottom of this pit there is magma
This is a fortress fit for dwarfs.