communal in this case means multiple people occupying the bathroom at the same time (e.g. there are 3 toilets, 4 sinks, 2 showers). Andrews has bathrooms that are shared by many on the floor but only one person uses it at a time.
Wriston quad (outside of wayland) is not freshman housing so that’s why I didn’t mention it. Wriston quad is all communal bathrooms.