The Venga has enough space for a large buggy in the boot, split seats with 3 proper seat belts, and enough space for 2 car seats with an arm rest in between - should that be a good idea!
I haven't given it 5 stars because the 1.4 engine doesn't seem to do the 400 miles per tank it's meant to do, but I expect that's because I mainly do short journeys with the occasional motorway run..
It is also a little harsh over bumps/sleeping policemen. But the kids don't seem to mind in the back - so perhaps that's just me!