I used to sell them when I managed a pet store.
They like the quiet and calm. They get startled when anything unexpected happens, whether it's movement, sound, or really just about anything. They're clean and not very smelly for a mammal. Wouldn't suggest as a pet for any child younger than a very mature 10-12 year old. Not a good first pet, either. You can make them as tame as any other pet by just holding them and letting them get used to you. Putting a shirt recently worn by the owner in their cage overnight every night will help. It will take a couple weeks of daily holding before they become fully comfortable with humans. I've seen some very personable hedgehogs, but it does take a dedicated owner. They eat hedgehog food (8-in-1 makes a good one) which looks like dry cat food. They enjoy mealworms and grubs as occasional treats, however these should never be gathered from outdoors because of the risk of pesticide and paracite exposure. They like to hide out in a turned-over shoebox with one end cut out of it. They need a 2'x2' wire cage with pine shavings (NEVER cedar, which causes respiratory problems in all small mammals).
Main points: They are a pet that needs a calm, patient owner, they are a pet that needs constant attention to be people-friendly.
Hope that helps.