There were over 1000 third class passengers on the Titanic. Their accommodation was much more modest than the other two classes. The size of the rooms compared to first and second class reflected the class attitudes of the age. The first class Turkish Bath was larger than the third class galley! A thousand passengers would rely on the galley but only a handful would have used the Turkish Bath.
The accommodations in the lower decks was much the same, or even better, as the bottom class folks lived at their home. Third class cabins were mostly located in the lower decks or less desirable parts of the ship, all single men and women were separated. Men in the bow and women in the stern. Families, however, were allowed to stay together in small comfortable rooms.