1 - Like any snake, the temperament will vary on the animal. As a rule, heterodon will bluff, hiss and fake strike. Defensive bites, while not unknown, are the exception to the rule.
2 - In general - they are easy to care for. The exception is that they can be finicky eaters.
3 - A regular western or mexican hognose itself looks cool - in my opinion. I'm really not into morphs so take that with a grain of salt.
4 - I keep my adults in a blanket box rack with a deep substrate. People keep them successfully in smaller enclosures.
5 - Either way. My preference would be an UTH.
6 - They can be very finicky. That is the only really challenging part of keeping them.
7 - My son's first snake was a western hognose. Westerns make an excellent beginner's snake.