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Easy and surprisingly not as boring as I'd expect, could just be because I can read the whole thing in a few sessions!
Only could rate this against the Minna no Nihongo ミラーさん小説1. Comparing the two, this is only slightly above the first volume of that series. They both use hiragana for words I usually see in kanji and full furigana. The thing that nudges this above the first Millar San book is the grammar. Millar San only uses unto N4 grammar (since it's textbook based, it's very strict about that) whilst this uses stuff you'll see in N3, slang, onomatapoeia, etc.
Likewise, there were a few words that children would find easy but us learners may not: animals, plants, food, etc.