Dante's Hell is very good, located very near Agripa's Pantheon, and in the heart of the city, you can walk at night to Fontana Di Trevi easily. Though we never met Flavia, they received us very well. The place is very clean. The apartment is located in a 3rd floor, but there is a very small elevator toy can use (it probably fits only 1 person with luggage), if you take turns it's just fine :)