Inspired by this recently resurrected question and beginning a re-watch of ST:Voyager.
Janeway's stateroom has a tub.
Whereas the average crew quarters seem to only have a sonic shower.
Yes, there are!
In the first episode of Voyager (the Caretaker), Tuvok walks in on Neelix taking a bath. This happens in guest quarters (not a holodeck), so regular crew quarters may not have bathtubs.
Neelix mentions latrines in "Bride of Chaotica." He tells Janeaway "Replicators aren't the only systems of convenience offline. We've only got four functioning lavatories for a ship of a hundred and fifty people."
Yes, Neexlix aand Capt. Janeway use a bath, Torres has a sonic shower on more than one occasion.
Neelix also mentions the fact that voyager has latrines, as some were broken... but I can't find specific reference to the episode. The only written source i've found is :- http://star-trek.answers.wikia.com/wiki/Why_does_it_seem_that_there_are_no_bathrooms_on_Star_Trek
I think the episode is Year of Hell.