Rome is a much better bet, plus it'll be about 10 degrees warmer. Berlin in a few weeks will be cold. They will appreciate Berlin when they're older.Would you recommend it for an 11 year old? Or is the sights more catered towards adults/teens?
The wife wants to go there at half-term, where I reckon Rome will be more interesting for him at his current age.
What did you end up seeing/doing?
We might be going in a few weeks.