All kettles can be operated intuitively. Kettles with controls on the handle are well suited for small spaces (Grundig, Unold, WMF). Control elements on the base offer a better overview, but these devices naturally take up a little more space. Water level indicators on the side of the container (Tefal, Unold and Carrera with indicators on both sides) are easier to read than those on the inside (Graef)...