My son is starting one next month. Any tips from parents whose kids did a year abroad? His course is taught in English so at least he doesn't have the language issue and he has a friend from his uni on a slightly different course who is going to the same uni so won't be totally alone.
Unfortunately I won't make it out to see him until next year as all hols already booked but will hopefully see him xmas/ new year depending on his other priorities (girlfriend in Scotland, dad who I'm divorced from)
We talk quite a lot on Facebook (although most of his replies are only 2-3 words but that's just him).
There isn't much on the net from students who've done erasmus years, but then I doubt my son will be adding to it so can't really moan.