The optically completely closed to the outside yard "behind the doors" is planted extensively in the vertical. Even in the pavement fixing grasses are allowed to grow as long as they remain low. The rather shady-damp biotope with some sun Islands is particularly pronounced on hot summer days "bearable".
The attentive and silent observer can sometimes a toad, a hedgehog and completely harmless (because shy and non-toxic) encounter grass snake.
Lately a rooftop ( "sundeck") is of course available at no extra charge.