If you think about it and are up for the scaling reality. I don't see how a 500 cargo freighter wouldn't fit in nicely. For a tavern that is or a small pub. A big luxury yaught you'd think would be a hotel or a casino or both. The barge? Wel let's face it that things a frakking station. The asteroid miner is compelling, i've used it before as a RP research facility but lets not go into that. Don't get a luxury liner please. Every time people think of providing services for passengers; Pretty much anythin OS&C would do it's a luxury liner off the top. Go for a vessel with plenty of windows, a Behemoth? Armored Transport? Use your imagination.
Now what would be interesting is a converted/decommissioned Battleship or Cruiser, possibly even a gunboat. The same principles as the Hood in another region of space. With so much room taken up by the Hold and the Armaments and Docking ports it seems reasonable, all you need is permission.