That is such a hard question to answer and it all depends on your perception of "niceness". In my opinion, based on my research, Anne was all of the following:-
* A virtuous woman who wanted to keep her virtue even if this meant saying "no" to a king.
* A good friend to those she loved
* An obedient and loving daughter
* A kind and charitable woman who was known for the large amounts of money she gave to the poor and needy
* A woman who exuded a kind of sexual magnetism - Although she wasn't a typical English Rose, she was said to exude sexual attraction and she used her eyes to tease and tempt.
* A loving mother - Anne hated the fact that as Queen she was meant to give Elizabeth up and not spend time with her. Anne fought to spend as much time as possible with her daughter. At her execution, Anne also did not speak out against the King or the conspirators because she wanted to keep Elizabeth safe.
* A feisty and determined woman who fought for what she wanted.
* A courageous woman who risked arrest to show Henry books like Tyndale's "The Obedience of a Christian Man".
* A quick tempered woman - She was quick to anger, like the King, and the couple were known for their huge rows which were quickly made up. She also faced death courageously and with real dignity.
* An ambitious woman - She was determined to be Queen and woe betide anyone who stood in her way e.g. Wolsey.
* A vulnerable woman - I think Anne was always worried that Henry would stop loving her. While Catherine of Aragon had turned a blind eye to Henry's affairs, Anne felt that she couldn't. It is also said that she was not very nice to Mary and I wonder if this stemmed from jealousy and insecurity.
* A patron of the arts and of the "New Religion"
* A cruel woman - She definitely could be cruel at times - when she refused to help her sister, when she celebrated Catherine of Aragon's death (although it is also said that she broke down in tears later), when she was unfriendly to Mary (although she did try to make peace at certain times), when she encouraged the King to get rid of Wolsey etc. There are many actions which can be seen as cruel and I don't doubt that Anne had her nasty side.
I guess what I'm saying by this list is that she was a complex woman who had many sides and characteristics. If you've read my recent posts on Anne Boleyn: The Witch, Anne Boleyn: The Whore and Anne Boleyn: The Martyr, you will know that I don't believe that she was any of those things, but it is so difficult to know exactly who she was when she is still such a mystery.