Gaia's place is great!
Perfectly located in Trastevere with an abundant of restaurants, bars, cafes, shops etc and easily walkable to any of the sought after attractions (20-40mins walk on average... I didn't catch any transportation other than to and from the airport). The area is safe and vibrant (especially Thurs-Sun) and totally fine to stroll around at night.
The room is small, but clean and comfortable and totally suitable for a solo traveler or couples. Having your own bathroom/shower and ability to come and go at any hour without disrupting others was a plus. There's a nice courtyard too that you can open the windows for fresh air, but when closed, no noise is heard so it's quiet for a nights rest.
Gaia was absolutely lovely and helpful any time I had a question of the area.
One of my favourite airbnb places I've stayed and highly recommend it for first time visitors (like myself) to Rome!