with the clio IV, I can vouch that you can easly fit 2 baby seats in the back and sit an adult in the middle without issue as there is no centre arm rest and there is plenty of head room. well...I'm only 180cm tall. the good thing with the clio front seats is that the backing of the front seats are soft leather (cup trophy) so if you have long legs, you wont bang your knees in hard plastic. The clio rear door also opens extra wide which makes life much easier when climbing to the back and install/remove the child seat.