We enjoyed our stay in the apartment - an amazing 10/10 location in Trastevere walking distance to bars, restaurants, taxi stands, public transport and about 20-30 min walk from Piazza Venezia and the center of Rome. If location is your most important attribute, look no further.
The apartment itself is OK - each room is on a different floor, so expect a climb to each part of the apartment. While this was not an issue for our group as we were all able bodied under 30, this could be a problem for others.
The listing shows 3 bedrooms but there is a caveat, which is that the 3rd bedroom is a loft, which means that the 2nd bedroom and 3rd are separated by a staircase, no door, so it's not as private. This is visible from the pictures, but its not entirely clear if you are quickly browsing through as there is no description.
The first bedroom is on the second floor (the floor immediately above the entry floor) and had a comfortable full bed. There is a shared bathroom with a shower across that bedroom with great water pressure and hot water. The floor in this bathroom seems to be rotting but that wasn't really a big issue for us.
The second bedroom is on the next floor, and has a sofa bed, not a true bed. Again, this is visible from the pictures, but it's not clear without a description. We didn't use the sofa bed, but there is also large closet which is useful for storing bags or hanging clothes. There is no bathroom on this floor.
The third bedroom (and master bedroom) is on the next and last floor, separated by a staircase. There is no door as I mentioned earlier. The bed is a queen and was very comfortable. We felt that the sheets weren't that clean, there were some stains in the comforter, but overall it did not significantly impact our experience. The bathroom was not the best for us as it was a bathtub with a shower-head with extreme water pressure. It is extremely easy to make a mess if you are not careful. The roof is very low so that you can hit your head as you stand up. In the end, I did not like the bath, and would prefer a proper shower instead. You might have a different opinion so take that with a grain of salt.
Miscellaneous: There is AC in the first and master bedrooms, the wifi was solid, and there is a (old) washer that we did not use. There is also a kitchen and fridge but we did not bother to cook so I can't help provide any info around that experience. The location is very very lively at night, but we had no issues with noise. Check in was a breeze, we met with Marius, someone that works with a host and he was very helpful, even going as far as making copies of the keys so we had a second set.
Overall, we were satisfied with our stay and would recommend particularly to those who value location over other attributes.