TBH, when I've listened to Swedish it sounds like a very easy language to learn. It sounds like most of the vocabulary is similar to Afrikaans/Dutch, and even though the pronunciation is different, I can still usually understand it.
Chinese on the other hand
Swedish and Norwegian both share a very melodic rhythm that is difficult to pick up, and they don't seem to understand you unless you do it too. It doesn't sound anything like Dutch or Afrikaans to me, but I wouldn't really know. However, I do have a Dutch friend who has lived in Sweden for almost 10 years and he can't speak a lick of Swedish, says it's impossible for him. Likewise, I've also never heard a Swede say they can easily understand Dutch. I've been to Amsterdam a few times with my Swedish girlfriend, and have a couple of South African friends too - I've never heard this comparison before from either side. Maybe you're just very good with languages?
In any case, Swedish is a Nordic language most similar to Norwegian (and Danish, at least in spelling and structure) and historically related to Icelandic. It's roots come from old norse, which is something like Icelandic. Dutch/Afrikaans is on a different branch of the language tree., although all languages, including English are heavily influenced by the nordic langauges thanks to the Vikings, so it wouldn't surprise me to know there were some similarities in Dutch. But there's also a many similarities in English and I don't know any English speakers who can understand Swedish just by listening to it.