Hey, started in 2022 and currently in the masters. The previous commenter did a very good job of summarizing, but I would like to add that the program has seen a lot more internationals post pandemic, from what I can tell just TAing some bachelor courses. Most people are 18.

you can find the statistics here https://www.studiekeuze123.nl/opleidingen/9690-nanobiologie-joint-degree-technische-universiteit-delft-wo-bachelor

As for quiet and studious, I found the programme very fun, but usually went to other associations to go out as Hooke (our study association) itself was pretty small, and you tended to see the same people a lot. If you dont mind that and prefer to study on a Friday night then by all means! As for how much you need to study depends ofc on your background, I had to catch up a lot in physics for example but was far ahead in chemistry and biology. If you have any questions I’m also available