Awesome view, but...
Just back from an epic motorcycle trip to MotoGP in Monterey, CA. My husband and I stayed at the SF Regency our second night out. We were upgraded to a suite due to being members of their Gold Passport loyalty program. This is my first review and I'm pretty good at being objective so here goes... We rolled in around 8:00 pm.
The first thing I heard as we walked in was a door man (? - top hat and long overcoat) complaining to his coworker that there was a group who was returning to their rooms last night, and when he asked how their evening was they said it was the best night of their lives, and then "Can you even believe it, they didn't give me a quarter or nothing!!" which made me think about my tipping technique. I didn't know you were supposed to tip the door man for addressing you. Really bad form... Complain about the patrons on your break where the rest of the patrons can't hear you.
The front desk wasn't feeling cheery, and they were not welcoming. Then again, we were road weary and probably didn't smile much either. 
We were put on the 8th floor, and if you went out on the balcony, you could see the pier and bridge. FANTASTIC view! The room you entered into was very cold both in decor and temperature. It wasn't a neo-modern look either... there was just nothing there. 400 SF with a TV, a chair and a couch. There absolutely nothing decorative, except for a stainless vase it looked like they found in a storage closet and placed in on top of a seriously scratched vanity that held the TV. The carpet had a cool design, but was F I L T H Y: multiple coffee (?) stains and something wet, sticky and smelly by the sliding glass doors. The furniture was old and well-used.The rooms were freezing; the AC had been blasting for quite awhile, and the temp in San Fran was no more that 60 F. We couldn't seem to get the place to warm up. And yes, we tried to rally the heater. 
Just a heads up for those on a pleasure trip thinking about staying at this Hyatt... It's in the Financial District, and because it's a business oriented area, nothing nearby is really open past 8pm. Fisherman's Wharf or Union area would have been better choices.
Where I'm sure it's probably rare, on another note if anyone else finds themselves riding their motorcycle to this location, there was nowhere on site for us to park our bikes. We were directed to the Embarcadero Parking where we paid a greater price than if we had been able to park at the Hotel (they wouldn't let us park in the same space, therefore we had to pay double). As you're probably aware, the Regency is a steep $57/night to park.
We'll find elsewhere to stay next time we're in San Francisco.