Usually my starting seven start out a little bit nicer than the rest, as things deteriorate into a busier, bustling fort, I tend to take less care.
At some tipping point as the fort grows, I begin to make larger rooms, typically 4x4, and place 3 beds in it. Everyone shares a room. This seems to count as a Meager Quarters, but as for thoughts, it seems to count as "He/she slept in a Good Bedroom recently." This stands unless you're exceptional.
Coupled dwarfs are allowed their own room with a shared bed. I also tend to give them two chairs and a table to share. The idea seems almost Spartan, in a sense: Soldiers lived in the barracks until their wife bore a child. I cut it back to marriage/coupling.
Exceptional performance begets exceptional rewards. I typically allow my dwarfs quality possessions when they've earned it through outstanding service. Military heroes are prime example of this. They typically earn their own tombs.
The Fort design I prefer use consists of 2x2 stairwells in the center of a 6x6 room. 2-wide hallways extending in all 4 directions, and 2x2 alcoves dug into the corners of the 6x6 room (1 square of the 2x2 overlaps with the 1 corner of the 6x6). 3 sarcophagi are placed in these recessed corners on every level of the main vertical shaft, as needed. That's a total of 12 sarcophagi per level, I currently have two levels with sarcophagi at the moment, many are empty. Sarcophagi can be occassionally relieved by the statues or other decorations as needed.
This is so those who have given their lives to the construction and prosperity of the fort are always in the minds of those around, and friends/family can be remembered.