This place is a great weekend getaway, I don' think I would stay here for more than that. Its bustling with energy, but with a slight sleezy feel about the place, I wouldn't recommend walking home by yourself at night. The city is expensive but worth it, hiring a bike is amazing! the Museums are top class. All in all a great brief trip.
Insider Tip:Its quite a small city, you don't have to stay in the heart of it (pay less and stay further out). If you want to go to the Anne Frank House book months in advance or you wont get tickets.