We rented from Allstar Vacation Homes. You can probably find cheaper prices, but I liked renting from an agency who was well-known. On the other hand, my childrens' preschool teacher rented about the same sized house for about half what we paid, but he was a private individual and in Great Britain. It all turned out fine, but she was very worried until she finally saw the house in person.
The only thing I didn't like about Allstar was the cleaning fee, which was really high, about $150. There were a couple of extra fees thrown in there as well. These are on top of your rental fees. Otherwise, I thought they were great. The place was pretty clean and very nicely decorated. The people in the office were incredibly nice and helpful.