purchase advice

hey @ all i am new here in the forum and have a question I would like to buy this car:http://www.autoscout24.de/Details.aspx?id=vgssiflr2oik What is there for typical weak spots in this model series??? what do I have to pay attention to???I have also learned the kfz mechanic handcraft but you can’t know everything about every brand as well what does it look like in things rust at the bottom or at the car body??? since the e-classes of these years of construction have enormous problems with rust. have a bad feeling now. so it wouldn’t be bad if you could share your experiences with this model or the 320 he motor. thank you already in advance gruss deep-flyer83