Here in the US there's a series on cable TV called "Selling Yachts".
Guess what it's about?
Anyway, it's on YouTube: https://www.youtube.com/watch?v=VXYMmZ5KjJI
Might give some ideas about design, features, and so on. They're not
quite up to the 100 servants mentioned by the OP, but it's a start.
Also I have no idea whether the show is real, fake, scripted, or fantasy.

My probably over-active mind came up with a couple of extra points:

1) Security. Anyone rich enough to afford something like this is going
to be worrying about their security. Especially if they are some sort of
politically powerful Noble (as seems common enough in the TU). One might
take this aspect of things into account when designing such a ship.

2) What's the point? AFAICT there are three reasons to be on such a craft:

2A) Habitation

If you're going to live on a luxury spaceship (or, RL, water) vessel, then what's
the point? It would be a lot cheaper to buy a house somewhere and live there,
plus you don't have to worry about sinking / hull puncture / piracy / system
failure / whatever. Also it's much easier to resupply if you're on a planet.
(You could consider that a physical presence on a planet might be *less*
secure than being on a spaceship, so you could run with that idea.)

2B) Getaway

I can see this, for a week or so at a time. But unless you have guests along,
you're probably going to get bored. Again, much easier to find a house someplace.
Unless you happen to like 360 degree views of ocean. You might. But in a spaceship,
you don't even have that. And at the tech levels of the TU, you could easily set
up your bedroom with full-spherical star views, if that's what you're into.

2C) Go places

Again, I can see this. Orbiting Jupiter or Saturn, never-ending views. You still
have the same problems with security / hull puncture / piracy / system failure /
resupply / whatever. Of course you can put a Jump drive onto the hypothetical yacht,
and go see the sights of some other system. But you still have the same problem with
failures etc, and of resupply. And boredom.

Counter-points welcome, and I hope this sparks some ideas.

Jonathan