Austin is approximately 79 miles from San Antonio and without stops it's about an hour or so to drive.
Hotel Valencia Riverwalk seamlessly combines elements of a sophisticated old world palazzo with eye-catching elements of modern conceptual design. Very nice accomodations, great restaurant and well maintained,it's Warm, romantic, clean and quiet. Just a short walk from the "main attractions" on the River Walk. Highly recommended!! Beautiful! I suggest you take a look here:
San Antonio hotels Have a great time!