I booked late one year and most of the main spots were all filled up. The last three years i had booked with Casa Rio Rentals. I have stayed at all three of the spots they rent. 1st year in a house on the frio that you can walk down private steps to the river. We actually floated from it one day, and floated to it the next day, cuts down on the trucks needed and such. She has a cabin called hideaway that is next door to frio country store, easy 100yd walk to the river, and another smaller place that is about 1/4 mile to the river as well.
I have also rented from Frioman. He has some pretty cool places but availabilty may be tough. Kickin Back is neat and not too booked, but not close to water.
Hope you have fun whereever you stay.