Amsterdam is like the four-roommate living situation. The scale of enjoyableness in a living situation is not directly correlated with the number of roommates, but rather, it dips around four roommates, then gets better when you get more again.
One other person is easy: you learn each other's schedules, and often find time to have the house to yourself. When people are invited over, it is usually low-key, unless the two of you decide together to do something more. Living with a total of three people is a little bit tougher, but still about the same as having one other roommate with a bit more complexity in the schedule.
Living with 7-8 roommates is also relatively easy. Things are almost always dirty, the dishwasher is always full, parties are not necessarily common, but true peace is rare. Nobody thinks you're a weirdo if you want to escape to your room for a while, and the rare moments of quiet feel like a treat. Often enough (since living with 7-8 people is a college thing), those rare moments are found when you also have to be quiet in the wee hours of the night.
The trickiest living situation is when there are about four total roommates. Peace becomes more common than in a bigger house, but only in short spurts that never feel like enough. One day, you expect a nice and quiet evening, only to discover that the rest of the house has each invited over two people and now suddenly there is a party. Similarly, if you want to have a party, it is a bit tougher than in the house of 8, as you have fewer hands to clean up the next day, and the logistics are generally a bit more complicated.
Amsterdam really provides that four-roommate situation. Peace is very difficult to find, but when you do find it, it mostly just reminds you that it is a busy city. Of course, the density of the city isn't really enough either, as clearly demonstrated by the lack of a really useful metro system. The rest of the Netherlands is basically the same.