Massimo's place is all he says it is. Centrally located we walked everywhere we wanted to go. The farthest was the Catacombe dei Cappuccini, about a mile away, 20-25 minutes.
Everything worked and it was well supplied to fix our own breakfast every day. Get the coffee from the nearby Torrefazione on Via Volturno. You can't walk more than 3 minutes without finding place to get you prosciutto, cheese and bread and milk.
Massimo communicated excellently always, met us nearby making it easier to find the place and even carried the one heavy bag upstairs. If you are driving, the APCOA parking structure on Orlando is the place to go; outside of the ZTL and only 12 E a day.