I know finnish, swedish and english and I studied german for 6 years. I understand most of what I hear (depends on accents of course) however I speak it so rarely that I've forgotten much, which is annoying. I've also done a few spanish courses and studied on my own and know a little bit, I can pretty much get by on holidays and so, but I really can't say I know the language.
Also I understand like 90-100% norwegian when I hear it and read it and like 80-100% when reading danish (not as much when hearing that's a lot harder) however I've never studied any of it. Also I think it's a bit funny that we've had to read a few articles and books in norwegian and danish in a class in uni (which wasn't about languages or history). Dutch is also moderately easy to get, because it's so similar to german (and swedish) (despite how much the dutch and flemish people hate to hear that), however the throat g-sounds do make it unnecessary hard at times.