Great place for a group that doesn’t stay in. There is only the kitchen for common space, but if you don’t spend a lot of time in, you won’t care.
Everything ancient is in walking distance. The Temple of Hadrian is literally across the square. The Pantheon is one minute.
There is (Jan. 2020) a loud multimedia show at sunset projected on the Temple, but other street noise is negligible.
One nice feature- a giant double headed espresso machine and many free pods in the kitchen. Score!
NOTE: some cab drivers will drop you at the Via del Corso (50m?) and insist that’s the closest they can drive. Uber drivers, on the other hand, drove us to the Piazza di Pietro by way of the Via de’ Burrò, almost to our door.