Beagles are very lovable and social. Although sometimes they may display their hunting instincts, they are generally good with children and cats. As for your furniture, it's hard to tell. I guess it depends on an individual dog.
As long as the puppy is kept entertained, is trained and is supervised you shouldn't have issues with anything being ruined. Beagles are curious and love to be with the family. My dogs are inside all the time unless I am outside with them, too much trouble 3 can get into without me!! For puppy owners I always suggest a basic manners puppy class.