The Admiral is budget hotel at the edge of the Tenderloin. For what it is, it is very good.
The building is over 100 years old. Windows don't always shut all the way, the elevator doesn't have an automatic door, there is exposed conduit in the hallways, the shower faucet leaks. Etc. It's not Hilton.
BUT, the owners have put love in, where it matters.
My room (#62) was newly furnished and painted, and exceptionally clean. There was a large desk. A modern TV with many channels. Soap, shampoo, and clean towels. A fridge and a coffee maker, with free coffee.
Were there strange howls from the street corner at 3 AM? Yes. There's also a midnight Taqueria and a 24 hour convenience store across the street, only a 5 minute walk to BART, and only a 10 minute walk to the Moscone Center, where I was attending a conference.
The concierge called in advance when it seemed I would arrive late (delayed flight), helped me get the elevator to work, and made sure I knew how to check out early.
Would I stay here again? Certainly.