I went to Hollywood Spa at 1650 Ivar quite a few years ago and enjoyed it very much. It is very large with a lot of facilities.
Perhaps some flyertalkers have more recent experiences that they would wish to share.
It's not the greatest location in West Hollywood but it is discreet.
I wish we had a similar place in NYC but alas the current bathhouses appear to be on the their way out.
I think the idea behind the Club Baths in Fort Lauderdale and the Hollywood Spa is that they are also a social center as well. I must confess that many times I enjoy gabbing with people at the bathhouses more than anything else!