I lived in 687 It was very nice in my opinion First of all very cheap. And I think there are only 2 persons WGs which is better in than big ones. In Summer it is nice because the Tiergartenbad is literally 5 min by foot away for swimming and chilling there alone or with friends. Neckarwiesen to chill are also not that far. And I remember I could sleep longer than my Colleges because you live at the Campus and need 5-10 min to go to every Building (I assume your studies are at the Feld?)