Lorena’s place is exactly as described and extremely close to everything. She was a killer host, even telling us a little bit about Piazza Navona’s history. The place is centrally located within walking distance to all sites, a block away from public transport, and close to taxi lot.
As far as the comments saying the apartment gets hot, Rome is very hot in peak season (June-August) and everywhere you go it will be EXTREMELY hot. We came last week of September where it’s still hot but it’s not unbearable and we didn’t feel hot at all. We will definitely stay here next time we come :)