Jonas enjoys being in the bathing room at the House of the Old because he views it as relaxing and safe. Since the story is basically told from Jonas's point of view, we can only speculate rest at the bottom.

I deifnitely believe that Larissa felt safe. The House of the Old is a place centered around safety and compassion. Those assigned to or volunteering therein met the requirements taking care of the old, who were respected and revered.