Finding the perfect hairstyle isn't a walk in the park. In order for it to be an easy style for medium hair it needs to be something that you can just put together when you wake up in... next picture

...the morning. Therefore it needs to be something that pretty much just falls into place, some of the most basic curly or straight hairstyles will be good for this as every couple of days they will need nothing more than going over with a straightener or curling iron. In some cases bobby pins are going to be all you need to keep that hair in place. Don't forget to use good shampoo so you can stay looking brilliant!