We loved this! There was always a couple available parking spots as this was in the heart of a residential area and the residents shared the parking lots.
Although, we never used the car as this is directly next to the San Pietro train station which is a HUGE bonus (also, use the underground entrance for this to walk/cross to the other side of the tracks for eating and exploring vs walking all the way down the hill, crossing under the bridge, and then backtracking up).
The train will take you directly to the Vatican and the Colosseum, where as every other rental we stayed at required at least a mile walk to the closest station.
(If you are unfamiliar with the metro system, buy your tickets at the bar at the entrance - we did a $19 Euro per person 3-day unlimited pass versus one ways as it can get very confusing and costly if you make mistakes and get on the wrong train lol. DOWNLOAD the City Rail Map app to help navigate the trains.)
It is also extremely close to the St Peter’s Square as well as many restaurants (about 1-1.5 mile walk). I would suggest using the train to get there with luggage if not renting a car as it is ground level when exiting the station. The street up to the rental is very uphill so can be taxiing with luggage (we saw a few people struggle).
The space itself is small, but absolutely wonderful and exactly as we hoped! A great studio apartment with under bed storage and a clothing rack/hangers. There is a small kitchen along with a washer for laundry. NOTE: you need to turn on the water heater switch in the bathroom for hot water (next to light switch).
There is also a small local cafe two doors down that always has locals, which is a great close option!