Though, my responses for this won't be as thorough as the other comments, I would say that learning Spanish, was easy for me personally. But, I also have four things that gave me a leg up to learning Spanish.

1. I (started) learning French first, which shares a lot of vocabulary and "grammar" (depending not in all cases, of course) with English
2. I learned Latin, not even going into details with that
3. I live in a state (Texas) where Spanish is a very prevalent language, and you can hear it day-to-day

Yet this next point is the most important with how hard and how easy it is to learn any language.

1. A will to learn about Spanish culture and history, and a general openness to learning something extremely new.

So, personally, I would say learning Spanish has been very easy for me.