Welcome to BetterBidding. From the Hotwire hotel list here at Better Bidding, this would be a match for both the Palace and W hotels. However, the TripAdvisor information you listed is a match for the W hotel, so that would be my best guess. As info, the W hotel is located in the Southeastern part of the USE zone, and is very close to the border of the Embarcadero zone. The W really isn't in Union Square at all. If you're somewhat flexible in your location, I would suggest booking the 4* hotel in the Embarcadero zone Hotwire is selling for $106 for your travel dates. The hotel HOTWIRE is currently listing for $106 is either the Hyatt Regency Embarcadero, Le Meridien or Omni. If your goal is to be near Union Square, I would book the Embarcadero zone in this case since what HOTWIRE is selling in USE really isn't in Union Square anyway! Not to mention you'll be saving $55 per night in the process! Good luck!