Yes, Maltese are easy to potty train. It only takes 1 to 4 months to fully potty train a Maltese puppy while it takes 4 to 6 months for most breeds and some can even take up to a year.
Because Maltese are small, they have small bladders. It is harder for them to hold their bladders which might make you think they are hard to potty train. But they are surprisingly easy to house train when given a strict routine and positive reinforcement.