Hi Corinne
We have just bought a 2009 Adria Altea 542DT and we absolutely love ours. It sounds like a really good deal to me, and at that price with all the accessories it won't be around for very long as the second hand caravan market is booming. The Adria Caravans are very lightweight, and buying secondhand is best when you are just starting out. The only reason we bought ours brand new is because my parents helped us out. They have had their caravan for a few years and wanted our kids to enjoy it whilst they are still young. I have 3 children and our Adria is the triple bunk layout, so with 2 children yours will be perfect.
It is a brilliant way of life for the kids, and you will never look back as I am sure everyone on here will agree.
I would definitely seriously consider it, the bunk beds in the Adria's are also alot wider than the UK manufacturers.
Sam