Can you become a CFI with only a PPL (EASA)? In Europe, can you get your CFI rating with a PPL only or do you need a CPL?

I assume that if you get paid to do flight instruction it's considered a commercial activity, so you'll need a CPL. But what if you do instruction without getting paid, do you still need a commercial licence to be a CFI?
The EASA requirements for a CFI ticket are:


Over 18 yo 
Hold a Commercial Pilot License or a Private Pilot License with the CPL theory done.
A minimum flight experience of 200 hours as a Pilot of which 150 will be as Pilot in Command
Hold a Medical Certificate Class I or II in accordance with
the license