For me it’s about honesty, mutual interests, understanding, a compatible sense of humor, self assured, energetic, and a sense of wonder, exploration, and enjoying the moment. That combo can get me almost every time.
As to physical attractiveness, that’s a big plus too, but in a partner it’s clearly second. I’ve found all too often that some women who I found average at first became dramatically more attractive as our relationship deepened and some who were heart stoppingly beautiful at first lost that aura, for lack of a better word, and we simply drifted apart (not a particularly good feeling btw).