Pluses:
Although we never met in person Hana was very personable to work with chatting over the AirBnB app, and tried to help and accommodate in every way possible when minor things went wrong (WiFi down, etc.). She seems to take a genuine interest in making sure her guests are satisfied if at all possible. The location is hard to beat being such close proximity to so many of the main attractions in Rome!
Downsides:
Hana's description is pretty much accurate although I'd say that 170cm for the upstairs ceiling is a bit of a stretch. Although the space between beams may be roughly 170cm, the beams themselves are significantly lower as is the shower, and someone much over 5' 2" will probably have to duck down to not hit their head. Also, the shower has a very small water tank (5 mins or less of hot water, then it takes about 20 to heat up again) so plan accordingly. Heating consisted of a small plugin space heater that was insufficient to really warm things up on a cold night. Hallway entrance had a pretty off putting odor, luckily the smell was less noticeable inside.
Bottom line:
For overall value I'd give it 4/5 stars considering the location, and Hana's quick response time and willingness to go above and beyond to try fix problems quickly. If you can get over the downsides mentioned above it'll be a great base to explore Rome from. If you can't then pay more for something more comfortable.