And something very important is a "Legendary Dining Room". A Dwarf can loose two pets and a child at once without going berserk, if he only can enjoy a decent drink and meal in an absurdly valuable dining room.
This of course is only an option if you are either playing without invasions or if you already have a working military, since it contributes to the "Bigger value, bigger sieges" problem.
To do this, dig a rather large room ( 20*40 is somewhat overkill but doesn't hurt) and fill it with chairs, tables, statues and so on. Build doors wherever necessary to make it "enclosed". Now you can press "q", move the cursor over one of your more central tables. The interface on the right now reads "r: Make Dining Room", which you press now and then adjust the size by "+" and "-". As long as you are with the cursor over this table, you can press "h" to make it a meeting hall (which you should if you don't already have one).
A Woodfurnace is also advisable, since it is the only workshop that gives other dwarves happy thoughts, as it counts as a fireplace.
To get the value high, smooth the stone completely (Keys : d->s). You can then go on to engrave (d->e) the smoothed stone, but you should do this when your Engraver smoothed enough stone to become a legendary Engraver. Best method is to let him smooth out your dwarves individual rooms, he will get experience very quick, and your dwarves will love their better rooms, too. Be aware not to Engrave stuff you want to remove later, that can give the Engraver very negative thoughts