Some of them have very good atmosphere, but maybe it is very very far from campus. Therefore, what apartment you like depends on your life style. There is a website that will give you an idea of apartment in Lawrence. An apartment is more spacious and newer. KU housing is quite old in some place.
Some places are new, but more expensive than off-campus housing.
However, for on-campus housing, you need to eat at the cafeteria. Food in cafeteria is not bad, but most of the food are American. Sometimes they have Asian food, but the taste is very plain like American cooking style. You need to buy furniture. Some of apartment is closed to campus, but more expensive.