Superb location, close to everything and excellent restaurants for a cosy dinner. Everything is new and working perfectly, except for the WiFi that didn't work on the 2nd floor and it was intermittent during our stay, especially at night.
There's a narrow and steep flight of stairs since the apartment is on the 4th floor. Check-in was very easy. Be prepared to pay cash for the city's fee on airbnb guests.
Bathroom downstairs has no shower, so guests must use the upstairs bathroom. Nice and hot water pressure.
The flat was sparkling clean and our host was always responsive and helpful although we didn't meet him in person. It's a good choice for Rome, especially for the price.