I use Gumtree all the time - Love It! It is owned by Ebay (go figure).
I use it to find tenants for our investment properties, to find staff for our cafe, and I bought my 2 bunnies via it. My experience of it has been very very very good!
*just to add: I also found our 'dog nanny' on Gumtree, she looks after our dogs when we are away.