My boyfriend and I stayed at this apartment for 3 nights in September. The apartment is on a beautiful street in a great location for exploring Rome, right on the edge of the historic centre and next to the river, which is a 5 minute walk to the Vatican. We walked everywhere from the apartment and didn't need to use public transport at all once we were there.
The apartment is a 15 minute bus journey from the station (which costs 1.50euro). There are supermarkets and restaurants a few minutes walk away too.
The apartment itself is on the second floor up a tiny spiral staircase - so wouldn't be ideal if you're scared of tight spaces. The apartment is cosy. The small space has been very well used, and was perfect for a base for a few days. It might be a bit small if you were to stay for a week and wanted to cook or spread out your luggage.
Alessandro was very friendly and helpful when we arrived, and was happy when I had to change our arrival time at the last minute. He showed us around the apartment when we arrived and then left us to it which was great.
I highly recommend this apartment as a base for exploring beautiful Rome.