I ran this adventure for my friend and her kids (ages 6 and 8) as Level 1 characters, and they loved it!! I modded it a bit to make it kid-friendly (the brewery made root beer) and I made all the combat encounters easy as this was their introduction to D&D. It took them 4 hrs - they investigated everything and took their time with the mosaic puzzle.
I would 100% run this again as an Intro to D&D session. Their response at the end of the session says it all - they asked if they accomplished enough to be leveled up, and asked when the next session would be!