I've been looking into this as well just now - different sector though (accountancy). I've decided I'd rather have someone more experienced for fewer hours. The apprentice needs a minimum of 30 hours a week and that would require significant training/time to get going with. I think I would rather have someone here for 8/10 hours per week, especially as its a home office. There are grants available for apprentices so its cost effective as they get paid peanuts. However I think the cost would end up being my time.
I recently had an intern working for me for a month (in my home office) from Exeter Uni - at the end of her 1st year on a Business & Marketing course.
It was a great opportunity to try out having someone working here who I was training to a certain extent, but I tend to agree with Emma that I would rather have someone experienced for fewer hours as it takes a lot of time to train a newbie and that time comes at a cost.