We absolutely LOVED staying at Andrea's place as part of our honeymoon! The apartment was very clean and looked just as it did in the pictures.
We loved the local restaurant recommendations and the bar across the street is awesome for espresso, snacks, breakfast, literally everything. We did cook a lot at the apartment which had everything you could possibly need and a grocery store about a 5 minute walk away.
In terms of walking, you can get everywhere in Rome from here in 2 - 20 minutes.
Personal recommendation: La Salumeria is AMAZING and about 2 minutes away. Their portions are ginormous, reasonably priced, and absolutely delicious!