Guru has free wifi vouchers based on what you buy, e.g. coffee, muffins etc. There's plenty of seating including some comfy couches as well as a decent number of power points.
Here's a map in case you need it:
The premise is: write code together, or at the very least, show each other code. We'll try to keep the catch up at the beginning of the sessions to a minimum (20 minutes or so), and spend the rest of the time getting down to some coding!