Home isolation lifesaver! So glad I waited for this one to be in stock, it's exactly what we needed. Kids can climb the 2 rock walls, the ladder, up the slide, crawl underneath, race cars on the slide, etc. 
Age: The age says for 1-2 years but it's definitely appropriate for a 4 year old that doesn't like tall slides. The slide is definitely tall enough. 
Size: It's bigger than I expected - the shape is rectangular, not square. It's a bit bulky, you will need to account for some space at the end of the slide for landing, around the ladder, and the sides to climb. Definitely measure your space. 
Shipping: 3 large boxes. You might want to leave a tip for the delivery person! 
Setup: Seemed pretty easy. About 40 minutes.