Being in a yoga studio amongst others or listening to a spiritual speech before a class is not the taste of everyone, I know it from experience. Private classes solve this issue.
I work pretty well with small groups and in one-to-one sessions. I prefer to have time and space to give adjustments when they are needed, and it is easier than with a big group of students.
It is simpler to have the class at your place, but if there is not enough space available or if you don’t live in the Reykjavik area, it can be done at mine.