Any language that close to your own language is easy to learn. For Germans Dutch would be easy. For Swedes Norwegian... For A Mandarin speaker Cantonese would be easy. If you come from a language where words are not inflected (Mandarin i.e.) you will find languages that inflect words difficult. One aspect whether a language is easy or not maybe also the availability of learning material. To give an example, I haven't seen many books on Shanghainese. You have struggle with that language just because of a lack of learning material.

Any language where you write the words in the same way they are spoken is easy.

Languages are inter-related. For example, if you know English, you can learn Spanish or French more easily. If you know Chinese, you can learn Japanese or Korean more easily. If you know Hindi, you can learn Urdu more easily, and so on, and so on..... Any language will be easy for you to learn, which resembles your own language,

Hi... There is no easy language... each one of them require efforts!

It depends of every single person, if u have that 'stuff' to learn some new language, u will learn it easy, but that stands that some languages r so connected between selves :) for me English is so easy language n German too! in German u have rules for reading n writing so if u know it u will learn it so easy :) while in English there don't have, but if u have talent u will learn it easy, U need just to figure it out how to write, n that u can if u read a lot of English texts, books, writing a lot on English!