Honestly, I’m just saying that a lot of people fall in love with the idea of falling in love with a university. The truth is, you can’t tell whether you’re a “perfect fit” for a university based on a campus tour. Besides universities with definite “personalities” (BYU, MIT, Alabama, etc.) most (especially top-tier) universities are very similar. I don’t think there is such a thing as a perfect fit for Stanford… it’s a very diverse place.
As for what @stanfordhopeful4 said specifically… besides SLAC, most other top universities have the things he/she mentioned. As for the laid back atmosphere… it may seem like it’s laid back, but in reality it’s anything but. The tension is just hidden really well. Google “Stanford Duck Syndrome” if you want to know more.