The phrase "separate bath" means that there is a bathroom or bathtub that is not connected to any other room or shared with others. It is a private bathroom or bathing area that is only for your personal use. Full definition
There is a kitchenette with microwave, toaster, kettle and a fully stocked mini bar fridge as well as an en - suite bathroom with separate bath and shower. (travelground.com)
There are separate bath tubs and rain showers, surrounded by marble, glass, and chrome. (thetravelmagazine.net)
There were supposed to be separate baths for men and women, but soon an elderly woman and her not - so - elderly daughter jumped in. (si.com)