Advantages
-beautiful historic city center
-lots of bars
-very good education and healthcare facilities
-compact city: everything is reachable by foot or bike
-location in the middle of the Randstad area: Amsterdam, Rotterdam, The Hague, Utrecht and Schiphol International Airport all within 45 minutes of travel time. Through this also Europe is at your feet.
-safe. I never felt seriously threatened or unsafe in my city.
Disadvantages:
-just a little too small, sometimes citizens seem village-dwellers...
-no space left to build, the city is as good as full
-no large green area or park, you're never alone
-car-infrastructure is insufficient, it's always faster to leave or the city by bike then by car, sometimes even of foot!