We attended a weekend conference at the Reston Hyatt and I was a little apprehensive given some negative reviews I had read relative to the service. I have to say that the service we received was friendly and efficient. We took advantage of the gym, which was relatively spacious and not crowded, at least when we went: lunchtime on Saturday. The location was fantastic with ready access to wonderful restaurants and shopping. Overall it was a lovely weekend and for a very large hotel, it was clean and well- managed.