We stayed in rondavels which only had a sink but no shower or toilet. Everything was great and for a backpackers quite nice actually. But why don't you simply put in a toilet and shower into these rondavels? This would certainly add a lot of value.
Otherwise there is a braai area, bar, lounge, kitchen, lots of large trees, a pool, large garden and all in all in a very beautiful setting. Would stay there any time!