Pros
Situated in one of the most "liveable" places on earth, Amsterdam. Surrounded by a sociable, liberal and relaxed culture where you can cycle to work, hang out in parks or nice bars and catch great live music at any day.
You get to work on some really awesome projects with really talented people (seriously, there's almost nobody who work here which I didn't respect their talent).
If you have a strong willpower you can convince them to do almost anything, or you can do things yourself, show how awesome it looks. And they would make it a part of them game.
They are trying really hard to improve.
Cons
Guerrilla senior management is almost exclusively composed of the same people that started the company, back when "everyone was in on it". This is not necessarily a bad thing, but where the company has now come so many years later, it really is. They still believe they have flat hierarchy, which they absolutely does not have. In fact, it's unclear to me if they even know how the hierarchy is composed.
This cause for many people massive pain and disgruntle. Example, you could be tasked to do work on something for weeks, taking full responsibility for it (while being a junior). Just to have your work cut before it's even been reviewed. Just because one person didn't agree with another and changed the design behind their back.
Salary is also not very competitive, especially if you want to live in central Amsterdam, where apartment prices are very high unless you feel like sharing (think ~1100 euro/month rent).