Our stay at Lorenzo's place was pretty perfect: the apartment is small but very charming, and has a beautiful (and massive) terrace that overlooks St Peter's catedral. The location is literally at Vatican's door - you can't beat that. There's a really good restaurant just downstairs that Lorenzo recommended and where we kept coming back. Lorenzo gave me some good tips about the neighbourhood that was really useful and let us stay late on the check-out day which worked fantastic for our late flight. Highly recommend the host :-)