If some rents a room in their house on a 4 or 5 night a week basis (say to students fir the academic year) - is this acceptable for rent-a-room relief purposes?
This page oulines the criteria which are needed for the relief.
www.revenue.ie
I'm pretty sure that this would also apply to renting to students who might habitually go away/home at weekends.
I'm assuming that you mean the same student(s) each week and not chopping and changing who stays in your house? That might be a different matter for the purposes of the Rent a Room scheme given that it might be more akin to an Airbnb type of short term letting?