I'm not a huge fan of facial hair. I prefer a clean shaven face. If he does have facial hair, it should be neatly trimmed. It just looks better that way. I really don't want to kiss hair, though. I don't want that rubbing on my face. It is not comfortable and can actually hurt. I have kind of sensitive skin.
There's a certain length on my guy that's too prickly when we kiss like if it's really short stubble it's ok and if it's longer forming a beard it's ok but in the middle it's not. It's usually a goatee style, for the most part I like the look.