If I can have a decent conversation without feeling like we are way too different then it helps me a lot. I tend to go out with guys who I have known for a while. There has been two occasions where this didn't happen and I learnt from them. I felt belittled and put down by them most of the time, so I knew it wouldn't really work out.
I have to be comfortable with a guy so I can just talk to them about anything and everything. Someone who not only listens but also adds input into the conversation. I don't really like to talk too much as I prefer an equal amount of effort in a conversation from two people. Plus I don't really like to hear myself talk so I tend to go quiet some times. Otherwise, I am this hyper 21 year old, making other people laugh, so as long the guy laughs then I am happy too.