Booking for next year to attend what we hope is a rescheduled wedding. At the tail end spending a night on San Francisco. I've got a 45k certificate and it looks like with that I could book the following:

San Francisco Proper Hotel
Courtyard Union Square
Hotel Adagio
Westin St. Francis
Park Central
Le Meridien

It's just one night (wedding itself is up in Napa Valley so just coming down Sunday mid-day before we head to the airport for an 1145am flight on Monday) but what's the best option from the above for a free night. Note we've stayed in SF a lot, usually at the Marriott Union Square (and my wife used to live in SF) so more just looking for best value (my gut says Westin despite the mediocre reviews due to location but open to other feedback).