Hi, Abdulmajiid, firstly can you explain what is meant by "modern aesthetic decor" as I am not "up" on that sort of thing.Cactii can look good any where, minimalistic milieu I feel lends itself to the use of large cactus specimens( the size of room will govern the shape of the plant).A "busier" room calls for groups of smaller cactii in several places, in exposed positions so they can be seen and admired otherwise there is no point having them.
Tiggerblue if it was an accident there is still hope for you . Cactii must be the easiest and most tolerant of plants to look after, and a good one to start with.