I had a wonderful time at this place! One of the best airbnb experiences I had, and I've been to a few... I fell in love with Rome, and a huge part of that was because how comfortable I felt in this apartment.
The building is beautiful, and it has a very convenient elevator to reach the fifth floor. The view of the city from the windows of the apartment is a charm, you can see the river at your left, and you can literally watch the sunset in front of you from the living room. It's amazing.
Everything in the apartment is top notch, from the cutlery to the shower to the washing machine. You can tell attention to detail has been paid here. Oh, and the location is just perfect, right across the river from Trastevere (which in my opinion is better than being in the middle of it), you can enjoy being close to all the bars and restaurants without the hassle of having all the noise right at your door. To the other direction, you're just some blocks away from some great coffee places, and even a famous michelin star trattoria.
I would highly recommend this apartment, and I'm sure I will stay there again whenever I go back to Rome (which I hope happens soon!)