I only need a sitter for extremely well behaved child, at most three to four hours to bridge time between my work and my partners studying.
My child is very independent, you will not be required to do much other than ensure their wellbeing for a few hours (generally 1300-1600) on Tuesdays and potentially Mondays as well, in the future. I would prefer you to watch my child in my own home as it is close to their pre-school and they are at the age where they are constantly being exposed to new environments and expected to remember them. At my child's own home will allow them to remain familiar with their existing surroundings.