I got in at midnight on Friday morning. Adrian was working all day Friday, so I spent the day wandering about Amsterdam. The weather was absolutely perfect. I explored the canals, checked out the Reiksmuseum, wandered across Museumplein, and then spent a good three hours in Vondelpark.
Maybe it was the sun, but I just got such a good vibe off the place. Everyone was friendly and polite, there were bicycles everywhere, there was just a very relaxed atmosphere. As I drifted off to sleep in the sun, several times I thought to myself: "This is how cities should be. This is what happens when people are just allowed to be themselves, take responsibility for themselves, when the government stops restricting human nature and just steps back and allows people to take care of themselves. I really did feel as though it was the best city in the world.
I caught up with Adrian for dinner- we went to an excellent sushi restaurant.
"So how was your day?"
"Oh, it was great, I checked out the canals, hung out in Vondelpark, everyone was so friendly..."
"...oh God, you're not going to be like Craig and just go on about how Amsterdam is the greatest city in the world, are you?"
"Uhm...no..."
This is a 
I bet if you didn't live in London, and it was a nice summers day and you were on holiday you would have got the same impression.
Anyway you did go on about it. For 3 days. Except for those times you were stoned and getting the twitches.
It's true- but I did feel temporarily ashamed for having such a cliched reaction to the city.
I agree that the summer's day was definitely a big factor in my overall impression of the place- Monday was far less pleasant.