I can thoroughly recommend Natalia's appartment. The transport connections are excellent : near to St Pietro Station with easy links to the airport and 1 stop on the train ( 2 minutes duration ) connects with the Rome Metro at Valle Aurelia. The local bus - every 10 minutes - connects with Central Rome in around 15 minutes and runs day and night. There is a supermarket nearby for stocking up and St Peters Square is walkable in around 10 minutes. The appartment is fantastic - spacious and with a view of nearby St Peter's Basilica from one of the two balconies. Great place to stay and great host ! Thanks Natalia.