Stayed here during a conference being held at the mega hotel Hilton up the block from Abri. Glad I chose the Abri, medium sized, clean hotel in a Union Square central location. My room was small but perfectly formed and the walk-in shower was powerful. My room had a strange smell to it during my stay which meant I had to have the window open most of the time for fresh air. Ask for an inner room to avoid noise from the busy street outside.
I visited SF about 5 years ago so was shocked at the amount of homeless people everywhere this time round. Every street corner was filled with people begging so be prepared to have your dollar bills ready.
Breakfast downstairs in the restaurant was good. Great shopping near by. Enjoy!