The apartment is charming and beautiful. It's compact but is finished to a very high standard. It was delightful to stay in. Ideally situated on one of the many squares Trastavere, and indeed Rome, has to offer. A bustling nightlife in the immediate vicinity certainly made us feel like we were right in the heart of the modern Roman culture. I can't recommend this highly enough. A possible negative of the locale was perhaps the daily bottle collection at silly o'clock. But with keeping the windows closed, and perhaps by drinking plenty in the evening, you might not notice.
Transfers were arranged for us and were prompt and efficient. It cost us 50 euros from Fiumincino and 60 to get to Ciampino airports, fyi.
The communication and care for the quality of our trip was very evident from the homeowners. Much appreciated.