Staying on the Aventine Hill was very nice. As a good walker, the apartment is well located, nestled near Testaccio, a twenty minute walk to the historic centre, and reasonably close to Trastevere. (While fairly self evident, it should be remembered that the place is located atop a hill.)
If you plan on cooking, and washing laundry, be ready to buy your own basics, as none were provided when we stayed. Still having a washing machine and a full-sized fridge was nice. We very much appreciated the AC in the middle of a heat wave.
Flavio is a very attentive host, quick to respond, and very conscientious in welcoming his guests. His suggestions for local eateries and coffee were appreciated.