Depends which model and what kind of bikes…I'm 6' 1" and ride a large frame (about 20") – 120mm full bouncer. In my older style Berlingo I could fit 3 complete bikes of this make up in and carry 3 bodies and kit for a long weekend biking. It was tight but was perfectly doable…
In the new style shape the back end has more space so it would be a complete breeze as the bikes would go up and down rather than across so should fit even better.
Best thing to do is try it but I didn't have any issues carrying 3 (but it was rare) – mainly carried 2 bikes and 2 bodies (or 2 bikes and 4 bodies depending on where we were going), plus riding and non-riding kit (and camping gear).
A very good car for practicality…I'd be after one next if I wasn't on such a tight budget and beeding to reduce my outgoings!
It isn't a looker by any means though! Berlingo is the cheaper version of the same car from Peugeot (the Partner) BUT the Puggie tends to come with a bit more things as standard, so if you want toys either spec up the Citreon or find a Puggie.