No cheap renaults are 5 star!! They are only classed as 5 star for the first 3 years after manufacturing. After that they drop due to the weakening over time. That said they are still safer than starlets. If you are concerned about the safety best thing you could do is fit a roll cage its the only real way to make it any safer. As for car seats I have 1 that fits in mine but that not a baby seat its more toddler im sure the baby 1s would be more awkward.