Ah, nicest... that's a matter of how we take it, not simply words thrown at us.
All my life I've been told I'm the most intelligent person some people have ever met (pity their lack of experience). Well, that hasn't been true since I was a child, and I went on to suffer a series of debilitating head injuries. If I'm the smartest person you know, you are in serious trouble.
And my partner's always going on about how I know more things than anyone he's ever met, a virtual walking encyclopedia. Or as he more frequently says, a "wealth of superfluous knowledge." I do love him so!
But nicest? Our friends address me as Saint Robert, because I can live with my partner, whom they all knew long before I did, some for over 20 years. That's kinda nice, but unkind to my partner, whom I wonder if they really know at all. If they lived with him they would know I'm no martyr, but rather blessed to be with him.
So nicest? Not my appearance, which drops you to the bottom of the credibility list. I suppose what I hear most often is that I'm friendly, and that people who meet me like me. Which surprises me, because that's not how I see myself, more dour and shy, and completely anti-social. But I'll take like-ability, that's nice & comforting.