No, Maltese are not calm dogs. Maltese are high energy dogs that love to play and are prone to hyperactivity.
Maltese are easily excitable when you play with them. They will be very happy and energetic while playing which will probably cause them to bark a lot. However, you can train them not to bark as much.
They also get quite loud when a stranger visits. Maltese make good guard dogs because they are always alert and will bark excitedly when there is a new person that visits.
Although they get excited from playing and visitors, Maltese can be calm when they feel comfortable with their family members, other people, and different dogs. Maltese love to cuddle and nuzzle, so they are calmer when they are showing affection.