I’m sure it varies from woman to woman, but I’ll give you my preference.
Clean socks and underwear, always. Minimal facial hair – if you have any it should be trimmed, neat, etc. Mustaches are almost always bad. Be aware of nose hair. Hair “down there” trimmed, but not shaven. Shower every day or every other day. Brush your teeth at least twice a day, bonus points for flossing and mouthwash. Clean your ears once a week. Wear a nice smelling and NOT OVERPOWERING deoderant. Cologne is nice for special occasions, as long as it is not too strong. (Boy smell is good. Heavy musky colognes are not. Neither is body odor.) Get a decent haircut (no matter what length your hair is) and make sure you don’t have dandruff – get a dandruff shampoo if it’s an issue for you. Keep hair products to a minimum. Keep your fingernails and ESPECIALLY your toenails trimmed.
Wear clean clothes, and keep it simple.