Mandarin Chinese: a not inflected language means less hassle with grammar.
The audio lessons here have an average lenght of 12-13 minutes and come
withfull transcript (one seperate PDF for every lesson, usually 2-3 p.) featuring latinized text and Chinese characters next to each other.
The two presenters of the language make this a pleasant and easy introduction
to the main Chinese language/dialect spoken in China, in Taiwan and elswhere
by almost a billion people.