I stayed 3 nights in Rome with my family at Federico & Irina's place. The flat is very spacious, in a real Italian apartment, and located in a very central area in Rome. You can easily get to different public transportation options by 8 to 10 minutes walk or most of the tourist attractions by maximum 30 minutes walk. It is equipped and designed smartly to answer your any possible needs during the stay. They even sent us a little guide which includes very useful recommendations for where to eat, what to do, and how to organize our days. The place was very clean and recently renovated. They were great hosts and made us feel at home.
I would definitely consider staying at their place when I travel to Rome again.