A disappointment
I stayed in this hotel this past week for a business trip and was surprised by its overall lack of service and upkeep.
I frequented SF many a times in the past and have strolled past this, supposedly a landmark hotel as she sits on the Union Square. 
The decoration in the lobby areas was as expected - 'rich' old world looked though not quite as grand and luxurious as the Fairmont Hotel. The front office 'agent' as they are called was pleasant and cordial. However, the room I was given was NOT what I had expected. Room # 666 - of all room number.
I realized this hotel has an old section and a new section and I was given a room in the old section. The room had high ceiling - a plus but, it was sparely decorated with one small 6 lamp chandelier high up in the middle of the room, one modern looking desk lamp and two traditional table lamps. One small entertainment credenza/refrigerator table? where a LCD TV sits on top. I did not bother to see if there was a refrigerator in it as I checked in late and was interested to just go to sleep and be ready for next morning's meeting. 
There was no wall mounted sconce lights - fancy or not, or any other additional decoration in the room - in a word, very sparsely decorated. 
The issues with this room are:
- one of the chandelier's lamp had burnt out - possibly just happened?? bad luck??
- the sitting chair (only one in the room) fabric was badly worn in places and scratched.
- entry area carpet had one grey patch of something in it - I did not want to step on 
All above issues were tolerable for a quick night of stay. 
Below are more troublesome issues. 
Bathroom ( quite small by today's stander)
- 3 strands of hair in the bath tub. 
- 1 strand in the self where hair dry was stowed 
- 1 used tangled dental floss in the corner of the floor by the sink !!
- the faucet knob for the cold water is does NOT have a stop to it - I could turn it round and round in both directions with cold water coming on and off as I rotated it.
The biggest issue I had with this room was the bed.
I must say the beddings felt 'top notched' 
The bed itself was a complete different story --- it sagged so badly on both sides that I ended up sleeping in the middle of the bed. The sagging is visible by sight - a bad thing. 
After a night of poor sleep, at around 6 a.m. I summoned the manger of the hotel let him know about all these issues. He came quickly. Was very pleasant, seemed sincere and apologetic. He noted the issues I'd pointed out to him and stated that he was dismayed that this room had passed inspection. He told me that the day time housekeeping supervisor(s) would call me for follow up as he'd asked for my cell #. Seeing his response and promised, I was satisfied. 
The problem - It's been 4 days since my stay there -- NO FOLLOW CALL(s) from any one from this hotel. 
I suspect this room is still being parceled out for other unsuspecting guests. 
Bottom line - a landmark hotel based on its historic legacy and location. The rooms are in great need of renovations and update. And the service and follow up - poor
It's overpriced and over rated.