We had a great time in Rome, and loved the apartment. I stayed in Trastevere previously and really recommend it as there's plenty to do in the evenings close by, yet it's walking distance to the main tourist attractions in the day.
I would say it's worth noting that the apartment didn't have any natural light, as it was facing inwards on a courtyard. This wasn't great for us, as we were hoping the balcony would get some sunlight! However it was clean and had all the things you would need. It can sleep up to 5 but the bedrooms are adjoined. It didn't bother us as we are sisters, but in case you're staying with people you don't know as well!
The hosts are extremely welcoming, and even left us a bottle of wine, which was a really lovely touch. Overall a great experience, and a very nice apartment.