When you stay in this apartment, you literally feel on top of the world! It has the most beautiful (360˚!) view, and it's very quiet and peacefull. It's perfect for 2 people and everything you need is there. You would think a little apartment on top of a building is hot, but it's actually fairly cool inside. The bed is wonderful. The shower is a bit small, but that's actually the only thing I can think of that was not 100% ;-)
The best thing is that it is very inviting of staying a bit at home, just to read or enjoy the sun. Very welcome when exploring such a busy and interesting city like Rome is.
There's a train station on a 3 minutes walk and a walk to the metro (over St. Peter's Square!) only takes 10 minutes. Busses are also close but less accurate than train&metro.
I would not hesitate one moment staying here again next time.