We don’t aim at a particular level, Diane. The ‘easy’ part is a function of the formatting, the support that the text provides to the audio, and vice versa, and how a person uses those.

Listen to the audio without the text and it’ll be harder than listening with the text, for instance. Use this material regularly and your familiarity with the format and topics covered will make it easier than it would be for someone using it for the first time.

Even in coursebooks aimed at a specific level, such as A1 (the easiest), or C2 (the hardest), the difficulty depends on the chosen task, not on the text itself. Potentially a course book designer could use the same text at every level, choosing tasks which are suitable for different types of student.

Insomma, this is probably suitable for everyone who follows the advice we give about how to use it (different ways for different levels, see our Advice page), and keeps at it for long enough for the effects to be noticeable.