The place itself is nice. It is exactly what it looks like, a mattress on the floor, in a room with a desk. I slept like a baby, and enjoyed the simplicity of the space. Had a nice cross breeze with the windows open, which brings up the only real issue: That McDonald's on the corner.
You're right next to the most notorious McDonald's in all of SF. Sketchy gang members hanging out in the evening, homeless all the time. The lights are so bright that they keep your room well lit, even with the blinds down. The noise seemed to get louder as the night went on, and the drive through PA system allows you to hear every order made at 2AM.
So yeah, I didn't mind the place, but bring a sleep mask and some ear plugs. Not