Pros
Good equity, good communication from leadership, benefits include Caltrain GoPass, which is nice since both offices are by Caltrain stations. Catered lunch, casual atmosphere, and people at the company are very low-politics and friendly. I made friends here. Company-provided computer is a new macbook. Several people have been promoted to lead new teams as they grow, you can definitely develop your career here.
Cons
Guidebook has only moderate salaries, as you would expect from a startup. The open office plan is bad-- no cubicles, not enough meeting rooms, not enough space in general.. They try to sit the salespeople away from the programmers but you can hear them even with headphones. Some days you can't find a desk to work at, or can't find a free conference room for your meeting.