The hosts are particularly kind and thoughtful. They went out of their way to plan check-in and accommodated our arrival as two separate groups. They were able to offer an airport shuttle service on request.
The location is in a hilly area about 800m (1/2 mile) from Materdei metro stop. If you're OK with walking and hills then it is a fabulous location for getting around with minimal fuss. Two of the more substantial catacombs are within a walkable distance, is is Cimitero Delle Fontanelle, though this is currently closed. Access to the Spanish Quarter and the main train station is easy via the L1 metro line.