1.Homour
This demonstrates to a woman that as a companion, the guy is just light-hearted fun person to be with. a guy who doesn't take himself seriously is less likely to be snobbish, uptight or a bore to be around.
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Even though most nice guys tend to wrongly believe that women chase after men that embody the "bad guy" persona, it's true to say that women genuinely don't appreciate a man who is abusive, controlling or loud. a person who cares is one whose love will last a long time.
3. friendliness
nothing warms your heart more than a significant other that is friendly to all your friends, family and any one he crosses paths with! again, illustrates that he is a good person overall. 
4. a sense of self-awareness (be sure of who he is and what he wants)
you can interpret this as confidence in who he is. it demonstrates immense maturity, and means he will not be swayed by the opinions of others. it's important to us as women because after starting a relationship with you as a guy, we need to be sure that you will stick by us to the very end and will not give up simply because someone thinks differently.
5. good morals
i appreciate any man who understands and practices his ethics - i.e. he knows it is wrong to cheat, he respects the value of family and friends, would never steal or commit any crime, etc. girls don't want to be with a guy who will pressure them to do something they don't want to.
6. courage (generally being firm about morals and beliefs - and not backing down when you need to defend them in cases of great adversary)
7. a great conversationalist
if you envision being with someone for a long time, you have to be able to talk to them about absolutely anything. be it politics, religion, sex, etc. all the "dangerous" areas of conversation should be open to you as couples, and as a good boyfriend you should not be easily offended or troubled by the differing views your potential girlfriend might have - just simply learn and develop your relationship through the various ideas you both have.
8. cooking skills!
believe it or not, even if we can cook better than you (okay, i guess only sometimes :P), a guy who -tries- to cook and will go to great lengths to at least help out in the kitchen is beyond the sexiest thing ever.
9. a passion for something
not necessarily an obsession. but having at least one thing that you feel strongly about. be it baseball, the band Queen, learning German, etc.
10. being you :)
if you're completely yourself (the most honest and bare you can possibly be without being boastful or egoistic) - you are one of a kind and very few girls can possibly resist that.