Well, I gave it a try, went twice in fact, but didn't like Kidspace at all.
The first time, there was barely anyone and my daughter got bored. The second time, it was crowded and she asked me to leave after 15 mn :-/
But anyway, Kids Up and Kidspace don't propose the same thing at all. Kids Up is about education, lessons, parent-child link, whereas kidspace is a play room. But I will tell you more once it is opened.
I discussed with the lady, and they are working on opening a playgroup in English, organised by a lady who used to live in the US and was in charge of such a group there. I joined their FB page to be kept informed