First time dog family brining home a 12wk old Frenchie girl. Our house is small. Entering, there are 6 steps up to the main floor to a small dinette and galley style kitchen, or 6 down to the basement level. One end of the dinette leads to dining room and living rm, which will be gated until potty trained. On the opposite end is the door to a hall leading to master bedroom, bath and office. The basement has a small galley prep kitchen, (which will be gated since I’m still puppy proofing it), a family rm with a futon couch. There’s a space set up for the exercise pen next to the futon. Facing, are my two older kids bed rooms. She’s still too tiny and will need to be carried up and down stairs. How does training, especially “potty” training, work with a bilevel house?