Incredibly disappointing
I was booked at the Mosser for the Fancy Food Convention. I was there for 5 nights. The location was excellent to the Moscone Convention Center, but I quickly began looking longingly at the Marriott Marquis across the street!
The building is a lovely old Victorian furnished with shabby furniture in the lobby with no real style. The desk staff were friendly but not terribly helpful. My employer was checking in later and had made the reservations, but had not paid for them yet. They allowed me to check in, but put the first night on my credit card, plus $25??? Bizarre. No one seemed to be able to explain why and that was after I complained when they wanted to add $75 to the first night's rate.
The room was dingy, due to poor lighting. The walls had black scuff marks on them, the tub had pubic hair in it. The corner sink was impossible to use without getting water everywhere. The bath amenities were environmentally "green" and smelled like vomit. The towels were threadbare and cheap. The bedsheets did not even cover the mattress on the bottom. The windows were sealed, no air conditioning and the room was not only very noisy, but hot. Wood blinds at the windows did little to keep the room darkened and were dusty. The more modern looking platform bed was okay comfort wise, but the platform was scuffed and dirty--clearly not an area that housekeeping was interested in maintaining.
There was no clock in the room, unless I turned on the wall mounted tv (with cords falling out from behind) to see what time it was. The phone was mounted on the wall and impossible to hang up without using the cord to wrap around the entire unit to keep the receiver from falling out. It was hung too high on the wall to reach for a wake up call from the bed. The wall mounted light over the bed, was also hung in a very inconvenient area which required standing up to turn off. Both choices were poor design choices and a cheap way to avoid night stands. The night stand that was attached to the platform bed was on one side only and was broken and tilting so that items slid off when placed there.
Housekeeping was loosey goosey. The bed was never completely made up with the decorative pillows that were on the bed at check in, and the towels, as bad as they were, were never replaced in the same spot. The glasses in the bathroom, once used, were never replaced, so I had to rinse them out and use the same ones repeatedly, despite my leaving notes for housekeeping, along with a tip!
A morning breakfast of a cup of coffee and mediocre muffin was offered in the lobby with little place to sit. While the coffee seemed decent, the only offering with it was sugar or equal, and half and half. No skim or low fat milk, no honey for tea--things one can expect to find even at a cheap hotel!
Concierge service was non existent. When I requested a call to the shuttle for pickup I was told that they did not use that company and so they didn't have their number--REALLY? No computer there at the desk to look it up?! I asked for some affordable local restaurants and kept getting referred to Annabelles next door, which was pricier than I wanted. That was the only restaurant they could tell me about. I went across the street to the Marriott Marquis where their concierge not only told me about some great places close by but she provided me with a list of many options ---and I told her I wasn't even staying there!!
My overall impression of this place is that someone had a few bucks and desire to turn a beautiful old VIctorian into a trendy boutique hotel and then they went off to travel or do something else leaving no one in charge or accountable. Clearly the only employees who were schooled in the fine art of hospitality were Joe the bellman/doorman and his counterpart. These two gentlemen were sharp, friendly, take charge and helpful every day. 
I wouldn't go back if it was free.