I am a mom that commutes in from the suburbs and works in Center City. I looked at TONS of daycare centers before choosing Kings Kids - and here is why I chose it.
The building does not look like much from the outside, even sometimes from the inside. BUT, they keep it clean, the kids always seem happy and engaged and the price is right. I hated the daycare centers that felt like cold institutions where everything was neat and tidy and the kids never seemed to be having fun. Kings Kids offers a warm environment for the kids and while I'm not sure they have degrees in education, etc, the teachers do care.
I started bringing my daughter here when she was 4 months old. whenever I checked up on her at lunch or when picking her up, she was always smiling. When she saw the teachers in the morning, she always smiles. Since she can't talk yet, her expressions speak volumes. Oh, another nice quality, they allow you 2 weeks unpaid leave for the year - meaning if you give notice, you can have 2 weeks you don't pay while your child is out on vacation. I haven't seen that in any other daycare that I looked at.
Cons - yes, they are psychotic about payments and they are always trying to find some way to impose an additional charge. But, if you do the drill, get there on time, pay on time, it's not a bad price. Another con, apparently they can close during the holidays with little notice if they know that few kids are coming. My only other complaint, occasionally it is hard getting answers because the office manager isn't always the most helpful but just stick with it, you'll get what you need.