This apartment is absolutely fantastic, and we had great value for our stay. The apartment contains everything that you could need (including a washing machine!), and has a beautiful balcony that overlooks the main square of Trastevere, but that also feels very private.
Elena was wonderful, and checked in with us by text from time to time to see if we wanted any suggestions or needed anything. She suggested some fantastic local restaurants to us that we tried out and loved (we even bumped into her at one of them when we went for lunch!).
The main square in Trastevere is a popular spot for buskers, which you can enjoy from your balcony. Thankfully though, Elena has made sure there are 2 sets of double glazed windows to block out the noise at night.
The apartment is right by the Ponte Sisto which is a bridge taking you over to the other side of Rome (where most of the attractions are), and everything is walkable if you're inclined. There is also a taxi rank a few hundred feet from the apartment, and we found that the majority of our taxis cost about €10 or less for what would have been a 20-30 minute walk otherwise. This is also great for when you're packing up to go, as we didn't need to book a taxi, we just waited at the rank for a couple of minutes.
Lastly, Elena pointed us to a very reasonably priced luggage store just a 30 second walk from the apartment which we used as we had a late flight.
I'd absolutely recommend staying here!