I've got people staying from Helpx. On the whole it has been great. Lots of jobs are getting done and most of the people staying have been fantastic.
I think someone has mentioned before about following your gut instinct about whether someone is going to be good with you. It's worked out well so far and I'm looking forward to meeting more Helpxers in the next few weeks too.
I've found it helpful to have a wish list of jobs that I'd like to get done and the Helpxers choose what jobs will suit them and what they would enjoy doing. They work for 4 hours a day, 6 days a week in exchange for a comfortable room and plenty of food. They help themselves to breakfast and lunch then I cook a meal for us all to share in the evening.
It's working well so far.