Anyone contemplating a visit should note that 3 of the major metro stations are now closed pending repairs to escalators: Repubblica ( now closed for more than 3 months), Spagna and ,as of today , Barberini. Speculation in the media ( FWIW) is that none will reopen before May at the earliest.
Buses are substituting on some routes from Flaminio. ( trains are running without stopping between Termini and Flaminio).
So maybe check it out before making plans on where to stay/getting around...that is if Metro is in the plans ( for me it always is..)