Ok. Re your last post, here's how to determine the distance:
go to this online map
input the best, full address you have for the hotel, from their website (this is important, French street addresses can be tough to pin down on online maps)
then click search
that should take you to the hotel
then look for the Centre train station, on the map, (hint: long bldg where train tracks converge, not too far south of the Papal Palace)
estimate the distance, by using directions, from & to feature of GoogleMap, there's an option you can click for it to give you Walking directions and walking times.
Print out map & bring with.