Hi! Best to seek advice from animal welfare organisations in your area - eg rspca, blue cross, pdsa, local vets, your local council's Animal Welfare staff. Someone should be able to give you good advice. You should get a good feed back from these people regarding recommendations for genuine dog/house sitters etc or licensed kennels/ home boarders. They will be able to advise you on the best option to keep your pet safe and happy for the duration of your absence.
Why don't you check out your local pet shops. They might have something advertised in the window? That's where I found my dog walker from (whilst I'm at work) and she also does sitting do so I'm sure lots of people will do it. Good luck.