Don’t think, just book it.
The pictures don’t do it justice. It’s a wonderful little escape, perfect size for two. Great windows, beautiful rooftop terrace, and the bed is quite comfy. Perfect quiet retreat from sightseeing across the river. The surrounding restaurants are all cheaper and way better than anything across the river too.
Mario is a wonderful host and met us at the door. Very friendly, showed us everything and gave great recs. He helped us book a private driver from FCO who took us to the front door, driving all the way into Trastevere. EASILY worth the 5 extra euros over a cab. The driver and Mario were in contact and everything was smooth, and we took a white cab back to FCO since there’s a cab line a block or two away.