Sergio's place is amazing - would give 6 stars if I could! It's very clean, new and spacious. By far the nicest place we've stayed in all of our Europe travels! Sergio met us in-person and showed us all around the apartment, and he's posted lots of local tips on transportation, places to eat, etc., around the place which is super helpful. The apartment itself is less than a 5-minute walk from Piazza Bologna metro, so the location can't be beat.