Use 'talkative' for positive or neutral settings; it can seem critical in sensitive situations. At the party, her talkative nature made her many friends.
Pro Tip 2/3
Not Just Quantity
'Talkative' implies eagerness to talk, not just speaking a lot. Although he's quiet at school, he's talkative at home.
Pro Tip 3/3
Emotional State
The term can indicate someone is in a good mood or feeling sociable. She was talkative today, sharing stories and jokes.