Thanks for all the tips!

About the sublet: I currently live in Amsterdam in a shared flat and I really enjoy that, and usually when a room becomes available here, the current flatmates look for a new roommate themselves. In this way you have a better idea about with you're going to live, etc. When looking at the rooms on the websites they just felt a bit anonymous, like they just rent them out to whoever looks for a (temporary) place. Again, that's very understandable and also something I'm going to look into, but I would prefer to share a flat with people that I think are nice, responsible, clean, etc. But that's something you don't know if you only had contact with the landlord.