It's called airmatic
It's a expensive option and not all w211s have it infact few do. There's another option on top of that called ABC which is adaptive damping. Otherwise It has standard suspension like on w203
W204 on the other hand has something called agility control suspension on base models which is basically automatic damping not air suspension. User cannot adjust or raise height or anything on this , agility control package was a option available but very few cars have it that let you adjust the damping to soft or hard but no control over height. AMG package w204 has none of that and standard stiffer shocks
W204 is not that low to cause a issue. W203 is even lower than 204 and even so with rear passengers it only scrapes on 25% of the speed breakers in Lahore but only if you cross head on
It's not a issue for majority of the time.
W211 and 204 share the same basic engine in c180 and e200 guise so similar economy only w211 is heavier so it's slightly worse but not bad if everything is fine. My w203 has better economy than my Altis on highway .
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