I had a Dwarf mix and she was very shy. However, once I earned her trust she was extremely sweet. I've found dwarves to be very intelligent and a bit...sensitive, haha! They can be moody sometimes but if you got a well-bred, well-socialized rabbit from a good breeder (NOT a petstore) you shouldn't have any problems

.
Oh, and right now I have a Dwarf Hotot mix so I guess he counts as a dwarf

. Because he was neglected he doesn't like to be touched but has been getting better lately. He's extremely happy, playful, and obedient.
My brother has a Polish Dwarf. He loves the breed
because of their independence and energetic personalities. His rabbit is outgoing and fairly friendly....but definately not cuddly!
However, if you are looking for a small rabbit for a child I would look into the
Holland Lop or the Jersey Woolie. I feel those breeds would be better for a child

. Both are calm and affectionate breeds that stay pretty small.