Hi Miss Inquiry,
I used to go there for UNDER 18s parties when i was back in Secondary School (then it was known as Camden Palais) and i've been there a few times since it was transformed to KoKo.
I HAVENT BEEN THERE FOR A CONCERT!
It is smaller than Hammersmith but it's a nice venue. Big Stage at the front and as you say very intimate.
Sorry i can't be more detailed but i think it'll be a very different experience as i've only been clubbing there - so don't want to give you any false impressions!
Have a great night x