Briefly, ’cause the downsides are ongoing….
The downsides: we ended up staying in an expensive hotel with the requisite building works (but a brilliant bathroom), I lost my luggage (on the way back), I was charged for a hotel room I didn’t take (idiot online booking fiasco).
The upsides: Mum paid :-), the Coliseum is astounding, there’s history at every turn, the food is amazing, the Vatican is insane, and the people are friendly. Had a very nice time.