Yes, both of those organisations at Rome Urbe Airport (LIRU) are friendly - I dropped in a year or two ago looking for a PPL dual flight around the city. I left it too late in the day but they wanted to help.
The airport is about 5 miles north-east of the Vatican. You need to go through a metal detector etc before you can walk down to the GA hangers/offices.
The "Neuvo Salario" train/metro station is just a few minutes from the centre of Rome - from the station you walk through a long subway under the railway tracks visible below and you emerge opposite the airfield entrance (across a busy road):
http://maps.google.com/maps?f=q&hl=e...&t=h&z=16&om=1