Where's German? German is one of the easiest for a native English speaker. Generally the entire family of Germanic Languages is easier as English is part of the Germanic Languages. Spanish, Romanian, etc. are from the Latin family and are somewhat different.
In my experience you can learn enough of a new language to get along in 1 week. The key is not to study it but just to practice it. Go to a foreign country for a week and in that week you will learn lots of words because you will learn what you need, when you need it and also associate it in your mind using multiple neural paths which is best.
You are hungry, you have to learn how to say "bread" or "stake" in Chinese - the moment somebody tells you how to pronounce it, you instantly learn it. forever. I was in China when I was a kid and wanted to know how to say certain phrases like "how much it costs", "juice", "beer", "embassy", "hello", "this", "that". I still remember them today after 15 years in which I never heard or spoken Chinese.
Learning a language by using it instead of studying it is much much easier and you also learn it better. There are things that get lost in translation really and you can't really learn those from a book.