This was our first time in Rome and we stayed at Valentina and David's apartment. We would definitely stay there again. The apartment was clean, very comfortable and the location was amazing. We walked almost everywhere, the apartment is 15 min from the Colosseum, the Roman forum, S Maria Maggiore and other important sites. If you don't like walking much, its 5-10 min from the main train station (Termini) and the local metro (A line).
We took advantage of the local grocery stores, cafes, and gelato places nearby when we wanted to cook or take a stroll at night.

Valentina has a wonderful book collection that contains many books about architecture and about tourism in Rome. She also has handy maps and other tourist information she keeps in the apartment.