...haven't tried the potato Lorenzo!
I have fairly good luck taking cuttings from a couple old garden rose varieties.
After they have finished blooming, cut fairly fresh pencil size canes (not too new and not the woody stuff)
I wear leather gloves and cut the canes into 8-10 inch chunks, pull the thorns off of the bottom half, cut the remaining leaves in half ( I was told to do this to keep them from loosing too much moisture, not sure it makes sense but I do it anyway

).
I like to start them in a pot with whatever potting soil mix I have...usually
compost, some perlite and my garden soil. Poke a hole with a pencil, push the cutting into the hole...I put three or four per pot....
Sometimes I cover with a jar, sometimes plastic, and sometimes nothing. Mold is a problem if it gets too moist but at the same time they shouldn't dry out.
I set the pots on the north side of the house....they don't need sun until they've developed some roots and want to bud out.