The Pool at Hilton Garden Inn Austin Downtown/Convention Center
Hilton Garden Inn Austin Downtown/Convention Center's pool is praised by professional reviewers writing for major publications. Of the 3 professionals that we monitored, 2 praised the pool, including Lonely Planet and Oyster.
Hilton Garden Inn Austin Downtown/Convention Center 
Lonely Planet
Oyster
Lonely Planet "From the lobby you can see the waterfall crashing over rocks into the small pool (and hiding a whirlpool)"
Oyster "However, the outdoor pool is small, and expensive valet parking is the only on-site option"
