My son is 2 and attends Kids in Wandsworth since last winter, I recommend it. It is pricey, but I'm so much happier with the care there than at my son's previous nursery where there seemed to be no love in the care, and very little fresh air time.
All purpose built, with a permanent housekeeper who cleans down the rooms and toys each night.
Lots of activities, like water play, sand play, singing, dancing, dressing up, painting, matching colours and shapes, singing the alphabet. My son comes out with something new whenever he's been.
Also nappies, food etc included so nothing to pack except spare clothes for your child's box - they do a lot of messy play so it's needed!
The staff seems to be a mixture of strict and caring, and they don't favour children which is good. They're really helpful when you need extra sessions or you're running late. The staff are allowed to babysit too so it's all above board.
There are male carers too which my son loves, and they don't change nappies - which IMO is good.
The spelling on your child's daily report is sometimes laughable, and I'm not keen on my son being taught "ta" when I make it really obvious that I say "thankyou" with him. But like sarahandruby said, they are genuinely caring. Especially in the baby rooms where they seem to lie aroung cuddling the babies most of the time!