Eva's flat in Trastavere is fantastic! It is very spacious for a one bedroom, and we loved having lots of space to compress after long days of sight-seeing. Also because it is spread over 3 floors, we didn't feel cramped at all. It is really bright with several windows looking out. The living room is perfect to relax on with a couple couches, and the sleeping loft is well-sized.
Location wise - Trastavere neighborhood is fantastic, don't stay anywhere else. In addition to Eva's flat being just one block from the Tiber AND walking distance to all the major sights in Rome (and the Vatican) - it is within 5 minutes of more restaurants and bars in trastavere then you could ever visit in a month.
Finally - Eva is a great host. She got back to us super quickly via message, and was able to make a couple accommodations that really helped ease our trip. Hosts like Eva are why I always use Airbnb for vacations, and I definitely would stay here again and highly recommend others do as well!