Rock climbing (indoor - outdoor) (Istanbul)

Hi,
I'm coming to Istanbul for a CELTA course from 12 October to 17 November Protected content .

I've just tried some rock climbing and would like to continue while I'm in Istanbul.

Does anyone know any good indoor climbing/bouldering gym?

Also... anyone up for outdoor or indoor rock climbing with a newbie? I will be new in town. Never been to Istanbul before and I don't know anyone there. Would be nice to do some activities with other people.

Tnx,
Naima