The shower drain is in the floor. I'm not sure how it is plumbed but
the floor is a cement slab. I'm assuming that they ran the drain below
the slab. If, by floor drain, you mean an open drain in the floor
then no, there is none. When I go back I'll run water into both the
sink and the shower drain.
Thanks for the suggestion on the toilet. I would never have considered
it since it was tight. If the odor does not go away I'll replace the