For a solo or duo traveler, this is a lovely place. The kitchen is fully equipped, there's plenty of place to spread out, and the bed is very comfortable. The ceilings in the loft bedroom are low, as mentioned, and I'm 5'3"/161cm so I did have to crouch but only barely. The bathroom and shower are lovely as well, but it is Rome so be prepared to take only a 5 minute shower. My only complaint is the dog in the yard (as mentioned in other reviews) and the upstairs neighbor - both can be rather loud and woke me up on multiple occasions. The house is located near the tram (currently a bus) line 8, which if you ride it can take you straight to Trastevere and Piazza Venezia across the river. The area is extremely residential - no tourists, but rather Romans going about their every day lives, so if that's what you're looking for this is perfect. Lis Mari was a lovely host, check-in was easy and she was delightful to meet, leaving a lovely book of things to do in the area as well as every measure possible in case of an emergency in the apartment.
All in all, thank you again Lis Mari!