Cerveteri is a town in Lazio.
There is a bus from Rome to the entrance to the old town. The Rome terminus is Lepanta Metro station on Linea A. There is also a train but the station is less convenient.
If you hire a car at Rome's Fiumicino airport follow the road to Rome for a few km and then take the Autostrada signposted in the direction of Civitavecchia. The exit to Cerveteri is about 15 minutes later, depending on how fast you drive.
There's a local bus from where the Rome buses start to the necropolis. The old town is very small and walking is all that is required. The new town lacks interest.
The main sight, and a quite remarkable one, is the necropolis of the Etruscans. These were built on town planning principles similar to those for cities of the living and it is truly a 'city for the dead' to enjoy their afterlife. The museum in the old town is also well worth a visit.
The Bed and Breakfast Casa di Anna at Largo Boccetta 5-6 is very good and, equally important, seems to be the only accommodation in the old town.