I thoroughly enjoyed book one of “Jen Nia Mondo”. I found it much more engaging than duolingo (which I’ve been using to learn Esperanto thus far). I enjoyed the retro feeling presentation of the book and recordings, and even found myself investing in Petro and Helena’s slightly dysfunctional relationship. The lessons do progress quite quickly, and for this reason I decided to repeat the whole course upon completing the final lesson, as I have not memorised all the information contained within the book and recordings. I am looking forward to starting book two, and am only sorry that there isn’t a book three!