The stem is indeed square and there are tiny hairs on newly grown stems, and on both sides of the leaves. Can't really see them, but you can feel them.
I live in Denmark and the plant lives indoor in a pot on a window sill. I think it started blooming because of stress/dehydration/small pot.
I talked with my friend who I got the plant from (cutting) and she says that the leaves turns darker/more red if left outside.
(Again, thanks for the help! You're awesome.)
