have a look at this one, it's my local
It's brilliant.
The food is cheap (children's plate for £1, which is a tablespoon of fruit, a tablespoon of crisps, cucumber, tomatoes, and half a sandwich - perfect for toddlers)
It's clean
It's not too big
You can have a months free pass for £20 per child
It has tables and chairs around the edges of the room.
Big things, like bouncy castle, ball pit, throwing games, etc, are in another room entirely, so not around tinies.
They sell fruit and it's cheaper than the crisps
they have a piano, tuned, for the CHILDREN to play with
they have a book corner, a home corner, a BRILLIANT dressing up box, a car mat the size of my living room will squillions of cars, a squishy mat for big babies, a very safe pen in a corner for little sleeping babies, bouncy chairs, high chairs, and a high table with pens, glue, ready chopped pages of magazines and catalogues, playdough
it's a very very good place. £5 for 2 kids, from 10 til 3. Bargain.