My 1-1/2 year old loves this!  I still have to watch him closely while he plays because he is still in the clumsy stage but he can climb up and slide down without any issues.  I gave it 4 stars because I found it pretty difficult to assemble.  Snapping the pieces together wasn't bad once I figured it out, but there aren't holes for screws.  Only drill spots.  I had a hard time getting those put in.  Other than that, it is the perfect size to keep indoors but sturdy enough for outside play as well.