How to grow Saintpaulia ionantha from cuttings

Common name(s): African Violet
Family: Gesneriaceae
Stem cuttings: no
Leaf cuttings: yes
Root cuttings/runners: no
Time: the year round
Lighting: bright to light shaded
Soil: mixes for cacti and succulents, indoor plants, herbs, vegetables
Temperature: 20 to 30 °C
New growth after: first roots are shown after 5 to 7 weeks, new leaves can be expected after another 6 to 8 weeks
More infos: insert the base of the leaf into the soil. The pot can be placed in a indoor greenhouse or kept covered with a freezer bag. But the cuttings also root good if not.