Do you mean the area in front of the lower level windows?

A mix of ground cover and low plants would be beautiful.

Make the planting island around the tree large and an irregular curving bed. Plant hostas and hydrangeas.

Whichever Geranium does well in your area.

Maybe you can try something like wooden ladder (drevený rebriniak in Slovak language). Something like this: https://belickova.xperimento.xyz/index.php/ekologicky-dreveny-rebriniak-o-nas/