Stayed at Berardi Aug 2019. Beautiful apartment and very spacious. Incredibly spacious for central Rome, really, and a 15 minute walk from the old city sights.
Unfortunately, the top floor with much of the living space (kitchen, library, living room) was unusable owing to heat. While the bottom floor (bedrooms) was air conditioned, I wouldn’t recommend staying here in hotter months, as half the space was wasted and therefore not of great value.