Tiny plants that you definitely still have room for. If you can't accommodate a full-grown houseplant, so-called "mini plants" are the right choice.
These hardly take up any space and fit in a small pot and even on the smallest ledge. Dwarf spider plants, small-leaved three-master flowers, Fittonia and small orchids decorate without taking up much space. Mini succulents, which are available in different sizes, are also particularly popular.