I got 15th-21st of Dec as a holiday (need to start/end in London) and not sure where to go with the brother.
I was thinking either Paris or Rome or both.
We wouldnt get into LGW on the 15th till about 245PM from KRK on BA. We could fly out that night on BA or the following morning to Rome and spend there till the 18th night, go to London, hop on the Eurostar 19th till 21st in Paris and back to London.
Or just do 1 night/2days in Paris
or do 15th night/16th-19th or so in Rome and spend a few days in London (brother wants to see a play )
Or go to Paris for about 4 days instead of Rome....
I need to keep cost down, so BA has good fares (incl in CE for my tier points) to Rome and I can priceline both Paris and Rome hotels so that would work out...

Any options? How many days would be enough? What to see/do/taste/etc? Rome, we don't need to go to Pompeii...