Only people who are close to the Clintons would know what those people are like behind closed doors. However, based on his personality before the cameras, he seems like he is easy to get along with and pretty friendly. There have been accusations toward Bill Clinton in the past where women accused him of some sort of inappropriate sexual misconduct. He denied most of them.
Probably the most famous accusation was when he had an affair with Monica Lewinsky. He totally denied that until later he admitted to it. I believe that Bill Clinton is probably nice and funny. He always seems to be smiling and kind to others when they are in his presence. Also, he wasable to help captured journalists in North Korea back to the United States.