Nice apartment: clean, stylish, practical, spacious.
Street noise is audible - especially during rush hour. If you want a retreat which lets you forget being in a big city, that's not the right place. Otherwise it's just fine (5th floor, solid windows).
We especially liked the location: it's in an average, non-touristic neighborhood. That means we start the day in the cafeteria next door with a flawless Cappuccino for 1€, get delicious pastry from the bakery on the opposite side of the street, get great Pizza for a few € from nearby etc.
Also, while not being super close to the center, we could easily get there with the nearby metro. There's also a cycleway alongside the nearby Tevere river which gets you there.
If you take the bus, don't rely on schedules (or on Google Maps which seems to rely on schedules). Rome's public bus service is notoriously unreliable. After losing nearly 1 hour waiting for a bus, a local told us how to: use https://moovitapp.com/ in order to have real-time information.
A little weakness was the WiFi which seemed to be capped at around 5 MBit downstream (didn't check upstream). Not a big issue for us as we didn't need it much and had the option to switch to mobile hotspot (LTE), thanks to EU roaming.
Sarah was easy to reach, friendly, helpful and uncomplicated.
All in all, we were very satisfied and hope to come back one day.