The apartment itself is very nice and cozy, it has all the amenities (including small kithcen with all the necessities, washing mashine & access to the ropes to dry the clothes at the rooftop). My personal favorite thing -- a mocca in each and every Italian airbnb apartment; of course, it's there )
The neighbourhood is very-very vibrant, so the spot might be a little bit too noisy for families with children or lovers of peaceful and quiet evenings. Since we were looking for a spot with active nightlife, bars and cafes, we loved it very much. Huge advantage of Trastevere is a lot of great food, of course. If you like to wake up early, there is a small bakery / sandwichery just 50 meters to the right from the house which opens early even during the weekend. You can buy your sandwich and canoli there and enjoy it in the apartment with a nice view at youngsters coming home from a very hard day's night, right from your window.