My favoured layout (given my propensity to set up 'blocks' of rooms within shift-cursor-sized squares) is as follows (here including one tile-width of the often 3-wide surrounding corridor)...
...............
.#############.
.#1+B+1#1+S+1#.
.#+++++#+++++#.
.#2+3+2#2+3+2#. Bedroom | Personal tomb
.#+++++#+++++#.
.#1+++1#1+++1#.
.###D#####D###.
.#1+++1#1+++1#.
.#+++++#+++++#. Dining Room | Office
.D+++++D++++2#. *or* (for Office-heavy nobles)
.#++T++#++T++#. Office | Dining Room
.#1+C+1#1+C+1#.
.#############.
...............
Letters: Bed, Sarcofagus/coffin, Table, Chair/throne, Door
Numbers: 1/2/3 = primary/secondary/tertiary locations in each room for chests/coffers, racks, stands, wardrobes, etc, (as required by each stage of noble neediness, distributed to buff the room-type that is currently least satisfactory, but I do like to flank the office chair with armour stand and weapon rack, whilst putting storage furniture in their bedroom and decorating the tomb with the second/third required furniture items if I don't need them elsewhere for need-fulfillment)
Other: # = wall (often ends up smoothed/block-reconstructed), + = floor (ditto, within suite-footprint), . floor (external to suite, rarely smoothed)...
The logic of layout is that dining experience is often the most frequent requirement (except for bookkeeper/manager/liason-meeting dwarf, where office may be more apt to be next to the suite's entryway), the tomb only ever gets admired, until and unless its ultimate purpose is fulfilled, and the doors probably locked up. Bedroom is 'two rooms in', as a compromise, but also gives two layers of lockable-door defensiveness (where that helps) for when a dwarf is most vulnerable... (Ignoring vampirical issues, naturally.)
Obviously this scales up or down, but this size works for me. But larger area, or across Z-levels, to house specific 'personal stockpiles', statue gardens, even (for a working noble) their own workshop-room. I might make secondary entrances for those needing extra access, or branch off of the main doorway differently/additionally.