Very easy climb - our 4 year old did it without a problem. Quick too, I'd say under 15 minutes from trail head to top. And the views are spectacular! Plus there's nothing like climbing a mountain in the middle of a city and then heading back down for burgers and beer, all in less than an hour!
Ample (paid) parking and well maintained with hand rails, steps, and paved path on over 90% of the trail. It is a bit steep but nothing too hard - as I said, easy enough that a 4 year old can do it!