Fons, I have two pot of haworthia, but they have grown to look fairly wild.
They are easy to propagate, take the best parts and repot them in fresh soil, water them once thoroughly, and put them away out of direct sunshine.
They dont grow that fast and they flower best when left alone, water them well every now and then, let the soil dry out intermittently, then they dont like bright sunny spots, shade is better,