Beautiful and quiet apartment in a great location. We walked around a lot, about 30 minutes from the Colosseum area, and 30 minutes from the Vatican. Close to Pantheon and Trastevere, many good restaurants in the street behind. Apartment was very well furnished and stocked, and had a charming unique layout.
As others said, bathroom is a challenge. You have to climb up stairs to get in, and ceiling is really low. Maybe around 5'8 in some parts but probably less than 5'5 in the shower. I wouldn't recommend for long stays, tall people, or those with mobility/back problems. Good for shorter folks or a few nights.
Hosts are very nice and helpful. Check in and check out were very easy.