We can't guarantee that bees from our hives won't sting you if you host one - however it's very rare that it happens!
Unlike wasps, bees will generally only sting in defense of themselves or their hive. If you stand on one, they'll probably sting you, but if one bumps into you on her way to a flower, she'll just carry on unless she gets stuck in your hair or clothing.
We choose our bees carefully before putting them onto peoples property. All of the worker bees in a hive are the daughters of the queen, so through careful breeding, the temperament of the hive can be controlled to some degree. If we find a hive that is aggressive, we can replace the queen and the hive will very quickly calm down.
The location of the hive can also be a factor, so we take the time to find a suitable spot where their flight path isn't going to have them flying into you as you spend time outside on your property.