The bikes were in excellent condition and very comfortable. A helmet is provided.
The staff is very friendly and will explain everything you need to know: stuff regarding the bikes, how to ride in traffic, the best path to the bridge, the best places to go... etc etc etc.
I felt the price was a bit steep but I guess it was worth since it was the closest place to the bridge.
Don't miss out on the bridge, i's a wonderfull view of SF. you can also cross it walking.