Basil because it is easy to grow, it looks nice and smells nice. You need to make sure it gets some water everyday. It grows well in the kitchen since there is normally a bit more humidity in kitchens.
Mint is also very easy to grow. Mint is can be used in so many recipes and in drinks that I don't think I go a day without using it.
Parsley is really easy to take care of as well. It grows really fast and it can also be used in many different recipes.