So my partner and I are going on a four month tour, leaving in just over a month. We'll be spending a week in Iceland before flying into Norway. From there we'll be biking Oslo--Copenhagen--Berlin--Prague--Vienna--Budapest--Venice--Barcelona. I've never been to Europe, and she hasn't been since she was a kid. I'm pretty confident with bike maintenance, so what's got me most curious/concerned is what sort of bicycle infrastructure/lack thereof I'm going to encounter.
Obviously, every one of those countries will have different infrastructure, but for those that have toured in these areas--what are some things to watch out for? Any countries that are especially dangerous for highway cycling? We're planning on tent camping as often as we can--how does that fare in major cities?
Basically, like the title says: what do you wish someone could've told you, before you found it out on your own?