Whoa! Had me going for a while. There is no Residence Inn near FCO. There's a newer Courtyard a short distance to the airport and that may what you're thinking of. These threads offer some feedback on that property:

http://www.flyertalk.com/forum/showthread.php?t=351531
http://www.flyertalk.com/forum/showthread.php?t=363167

Also, I use www.tripadvisor.com as a resource for opinions about hotels.

Welcome to FT and enjoy your time here.

P.S. don't feel shy about using the search button at the top of the forum page as there's lots of great info that may be off the first few pages.