This is a GREAT location, and a great price, for San Francisco. I walked right down to the wharf, stopping at a literally "hole in the wall" to get coffee. Super close to Coit Tower, and right down the street from Union Square and Chinatown. You won't find a better deal.
Make sure to let Irina know when you'll be coming in. Greg is very helpful on neighborhood locations, and will probably be there to let you in as long as you communicate your arrival time.
I would recommend earplugs if you're not used to city noise. The bay window room does overlook the street, but I slept great with earplugs in. Enjoy your stay!