I used a house sitter last time as my brother had just moved to a new development and I didn't trust my dog to not escape. I found her on Aussie House Sitters (and there are a few other websites like it out there). Even though I only needed someone for two weeks, I had lots of people applying.
It wasn't all smooth sailing though. I met the girl I ended up trusting my house and dog to twice, and she had all the references and everything, but I still panicked for the first couple of days. I couldn't get in contact with her (I forgot to leave her my wifi password....) and so there were a few hours of frantic international call enabled public phone hunting while in Osaka. When I finally got a hold of her, all was fine (of course!). But then, two days before I was due home, I got an email to say that my dog had been attacked while out on a walk

oh man, did I feel like a guilty mum...I was already winding down from the trip at this point, and wanting to go home, but add this worry to the mix and I was becoming desperate.
The sitter was very good, she chased away the attacking dog and rushed mine to the emergency vet. She picked up the bill and I reimbursed her when I got home. The dog was fine, but she had some pretty messy bite wounds and staples in her back.
I'm not sure I'd do it again. A couple of elements to the story the sitter told didn't quite add up, and the actual experience made me think - you can hand over your keys to someone, and they could say that they're going to be there to keep your house / dog company, but are they really? I got photos every couple of days of my dog, so I know she was there in the middle of the time, but at the beginning...? Who knows.
But then I also don't know if I could trust a kennel. And finding someone within your circle who is old enough and responsible enough to look after a house and animals, but without all the commitments that they can move in and look after yours for a few weeks is tough!