Cosy hotel!
We stayed here for 5 nights in May, and found this hotel well priced compared to others around San Francisco. The Hotel is fairly old but has a nice feeling to it. The rooms are very comfortable and have all the amenities you need when you're travelling. 
We were told the location was not the safest but walked around alot day and night and never had a bad experience. There is also public transport very close and Union Square is about a 10-15 minute walk. 
Would definitely stay there again.