I also used for airport services Olympic Limousine Service ... they were very professional and cost was very reasonable. They can be reached at [email protected] (40 euro to the airport for a car), the owner is Valerio Sacchetti. Website is http://www.olympiclimousineservice.com/eng/index.html
I also did a walking tour ... I hired a private tour guide named Federica. Her website is: http://www.guidaturisticaroma.it/englishmain.htm. She is very knowledgeable and I enjoyed the tour.
In rome, I stayed at the Franklin "Feel the Sound" Hotel. It is near the vatican. It can be out of the way for some people ... it is about 5-10 min walk to metro. Very friendly staff. Room was clean and modern style. Breakfast was very good.