The seller is being honest and telling you they get. You may find it is different unless you drive the same way and on the same roads and at the same temperatures etc.
Renault say 100km (62m)
I get in the UK 56 to 83km (36 to 52 miles)
So 70km appears fair but not knowing any more hard to say.
Slide your camera phone under the front seat and take some pictures up underneath. To see if it has cracked. Should get replaced under warranty.
The biggest problem will be the brakes.
Do they work
Do they come off after applying.
Does the handbrake release the brakes on both sides.
Do the brakes stick on.
All can be fixed by a normal garage if you cannot do it yourself. They are more like Motorcycle brakes. Except the rear ones need to be manually set up.